Inland Water Transportation (U.S.) — Industry Primer

NAICS 2022 code 48321. A general guide, for public-market and private investors alike, to the two very different businesses that move freight and people on America's rivers, canals, and inland lakes. This is a rollup primer: it synthesizes the two child-industry primers and adds our ground-truth federal statistics for the combined level.

NAICS is the North American Industry Classification System — the U.S. government's standard scheme for grouping businesses. Code 48321 sits one level above two five-digit — actually six-digit — child industries:

• 483211 — Inland Water Freight Transportation (barges and towboats: grain, fuel, chemicals, aggregates).
• 483212 — Inland Water Passenger Transportation (ferries, water taxis, dinner/excursion boats, river cruises).

Both ride the same rivers under the same federal rulebook, but they are almost opposite as businesses. Freight is a capital-heavy, cyclical, bulk-logistics industry that punches far above its headcount. Passenger is a small, labor-heavy, subsidy-and-tourism industry whose one growth story — American river cruising — is a premium travel niche. The rollup is dominated by freight: barge cargo is roughly 92% of the level's revenue [1].

---

1. Overview

If you own or lend against anything in NAICS 48321, you are really making one of two bets, and they behave differently.

The freight bet is a bet on a moat-protected, asset-heavy transport cycle. Federal law (the Jones Act) reserves cargo moving between two U.S. points for U.S.-built, U.S.-crewed vessels, which walls off foreign competition but makes the fleet expensive and slow to expand [12]. That slow supply response produces long profit cycles: tight fleet → high freight rates → over-building → multi-year glut → recovery. Returns are governed less by any single year's cargo than by two slow variables — where the barge fleet sits in its build/scrap cycle, and what the water does [9][20].

The passenger bet is a bet on route access and, in one corner, on affluent-traveler demand. Most of the ferry network is government-owned and funded by fares plus taxes and federal grants; the private money is in contract operation and in the river-cruise niche, where U.S.-build rules again create a protective moat [15][16][17]. Value here is corridor-specific: a ferry is worth most where it solves a connectivity problem no bridge or rail line does.

What they share: the Jones Act / cabotage moat, U.S. Coast Guard inspection, dependence on U.S. Army Corps of Engineers locks and dredging, acute exposure to droughts and floods, and — for public-market investors — the frustration that there is no clean listed pure-play in either child. Public exposure is one near-pure freight proxy (Kirby) and a diluted global-cruise proxy (Viking); the rest of the industry is private, captive, or government-owned [8][10][16].

---

2. What's inside — the two children and how they differ

This is the distinctive value of a rollup: the contrast between the children. Lead with it.

Contrast table

CR4 = combined revenue share of the four largest firms. HHI = Herfindahl-Hirschman Index, the standard antitrust concentration gauge (higher = more concentrated). KEX/GEL/VIK/KLS are stock tickers; ADM = Archer-Daniels-Midland; ACBL = American Commercial Barge Line; PE = private equity.

The one-paragraph version

Freight and passenger are grouped together because they float on the same water, not because they behave alike. Freight is nine-tenths of the money and five-sixths of the jobs, and its firms are on average ten times larger by revenue than passenger firms — because barging is capital-intensive (a handful of mariners push cargo equal to a thousand trucks) while people-moving is labor-intensive. Passenger firms are nearly half the count in the level but a rounding error of the revenue. Freight's growth question is cyclical (the barge build/scrap cycle); passenger's is bifurcated (a flat, subsidized ferry backbone plus a fast-growing but tiny river-cruise niche). And their ownership maps differ: freight is private-industrial (family fleets, PE, captive shippers), while passenger is uniquely public-sector-heavy on the ferry side.

---

3. How big it is

Our ground-truth federal statistics for NAICS 48321 (the combined level). They come from two programs — the 2022 Economic Census (EC) and 2023 County Business Patterns (CBP) — so they are not a clean single-year series [1].

The child figures sum cleanly to the rollup (employees, establishments, and first-quarter payroll match to the dollar; firms and receipts to within rounding) — a good sign the two primers and the level stats describe the same universe [1][2][3].

So this is a ~$8.3 billion-revenue industry run by fewer than 600 firms and about 21,000 direct employees [1]. The small headcount is not an error — it is the story. Average revenue per employee across the level is roughly $391,000, and per firm about $14.6 million [1] — but both blend a capital-heavy freight business (~$427K/employee) with a labor-heavy passenger business (~$202K/employee) [2][3].

The undercount caveat — read before you size this market. The federal counts understate real activity on both sides, for different reasons:

1. Freight misses captive shipper fleets. When ADM, Cargill, or a cement maker moves its own product on its own barges, that tonnage is usually booked under the parent's primary industry (grain, energy, manufacturing), not under 483211. ADM's American River Transportation Company (ARTCO) alone runs one of North America's largest covered-hopper fleets [11]. A meaningful slice of real river tonnage sits outside these numbers.
2. Passenger misses government-owned ferries. CBP and the EC cover private employers with paid staff and exclude most government workers — yet a large share of ferry service is publicly operated. The Bureau of Transportation Statistics' National Census of Ferry Operators (BTS/NCFO) has identified roughly 200-plus U.S. ferry operators carrying on the order of 100-plus million boardings a year (a total that also spans coastal and Great Lakes systems) [19].
3. Both miss nonemployers. Owner-operated barge and single-boat passenger businesses with no paid staff fall under separate Nonemployer Statistics, absent from this dataset — so the smallest end of each trade is uncounted [1].
4. Receipts are a thin margin, not cargo value (freight). The ~$7.6B of freight receipts is the freight bill, not the goods. Roughly 465 million tons worth over $158 billion travel the inland system yearly [4]; the U.S. Army Corps of Engineers put internal U.S. waterborne tonnage near 449 million short tons in 2023 [5]. Carriers earn a fraction of the value they move.

The physical stage for both children: about 12,000 miles of commercially active inland channels and a lock-and-dam network most of which is past its 50-year design life [4]. Our stats file contains no sector-wide fleet count, utilization rate, freight rate, load factor, or margin — those must come from company disclosures, not be invented at the NAICS level.

---

4. The investable universe — where value concentrates

Value concentrates overwhelmingly in freight, and within freight in private and captive hands. Passenger offers almost nothing to a public-market investor and its private value is corridor-specific.

Public companies (all indirect or partial):

None is a clean 48321 investment. Kirby is the single best public handle on the level, and even Kirby is only part inland freight. There is no U.S.-listed pure inland-barge or inland-ferry ETF; broad transportation and travel funds give only trace exposure.

Major private / captive / government owners:

• Freight: Ingram Marine Group (family; generally cited as the largest overall inland operator, no published fleet count) [13]; American Commercial Barge Line / ACBL (~3,550 barges, Platinum Equity-controlled) [14]; Marquette Transportation (family; acquiring Canal Barge in 2025 to form one of the largest fleets) [8]; and captive fleets at ADM/ARTCO, Cargill, and CGB [11].
• Passenger: American Cruise Lines (Robertson family; largest U.S. river-cruise line, owns its own shipyard) [17]; Hornblower / City Cruises / City Ferry (PE-owned after a 2024 restructuring; operates public systems including NYC Ferry) [18]; HMS Ferries (contract operator of public systems); plus state DOTs, counties, and port authorities that own much of the ferry network — where "investing" means municipal bonds and federal grants, not equity [16].

---

5. How the money works

Because the two children earn money in almost opposite ways, treat them separately.

Freight — keep expensive steel utilized at good rates. The core levers are barge utilization (the share of the fleet working; barging's version of hotel occupancy — low-to-mid-90s% supports pricing power), freight rates split between stabler multi-month term contracts (usually with fuel escalators) and fast-moving spot voyages, and asset productivity (revenue per ton-mile, tow density, empty repositioning). Well-run inland operators earn segment operating margins in the high-teens to low-20s% in good markets [8][9]. The cost base is fuel (largely passed through on term work), crew, maintenance/drydocking, and heavy depreciation and financing. The supply cycle is the whole game: because new U.S.-built barges are costly and slow to build, fleet size adjusts sluggishly, producing multi-year rate booms and busts.

Passenger — three models, none of them "shipping."

• Ferries & water taxis are contracted infrastructure, not profit centers: revenue is fares plus public operating payments, capital comes from federal grants, and many crossings are free. The private angle is management fees for running public routes.
• Dinner/excursion boats are high-fixed-cost day boats where a rained-out weekend is revenue lost forever; charters smooth the curve.
• Overnight river cruises behave like floating boutique hotels: revenue ≈ berths × occupancy (load factor) × net ticket yield, with high operating leverage (the last cabin filled is very profitable) and a U.S.-build capital premium.

The metrics that matter also differ: freight investors watch utilization, spot vs. term mix, ton-mile yield, fleet age; passenger investors watch load factor, farebox recovery (fare revenue ÷ operating cost), subsidy/contract revenue per passenger, and contract renewal risk [8][10][15].

---

6. What drives demand

Freight demand is derived — it rises and falls with the bulk industries it serves: grain exports (roughly 60% of U.S. grain exports move down the Mississippi system, seasonal at harvest) [6]; energy and petrochemicals from the Gulf Coast (the heart of the liquid tank-barge trade); coal (a structural decliner as coal plants retire); and construction/industrial materials [5][6]. It is pro-cyclical and commodity-sensitive.

Passenger demand splits by tier. Ferries run on geographic necessity (islands and river crossings without a bridge), urban congestion, and public-transport policy — offset by hybrid work softening weekday commuter peaks. River cruising runs on demographics (an affluent, older, growing domestic-traveler cohort), "explore America" domestic-first travel, and supply-led growth (revenue tracks how many U.S.-built hulls the shipyards deliver) [15][17].

The one demand driver both children share is the water itself. Droughts that drop the Mississippi disrupt barge loading and cruise itineraries; floods, ice, and Gulf hurricanes halt both. This shared, hard-to-hedge weather exposure is unusual and defining for the whole level.

---

7. Regulation

Both children live inside the same federal maritime framework, with tier-specific overlays.

• The cabotage moat. Domestic point-to-point transport must use U.S.-built, U.S.-owned, U.S.-flagged, U.S.-crewed vessels. For freight this is the Jones Act (Merchant Marine Act of 1920) [12]; for passenger it is the Jones Act plus the Passenger Vessel Services Act of 1886 (PVSA) [21]. Either way the effect is the same: foreign competition is shut out (a durable moat) but newbuild costs rise and capacity grows slowly.
• U.S. Coast Guard (USCG) inspection. Freight towing vessels fall under Subchapter M (fully phased in July 2022; Certificates of Inspection or an accepted safety-management system) [22]; passenger vessels fall under Subchapters K and T, with an inspected-vessel/certificated-crew requirement above six passengers for hire [22]. Both regimes raise fixed costs and modestly favor larger, well-capitalized fleets.
• U.S. Army Corps of Engineers (USACE). The landlord and plumber of the whole system — it builds, operates, and dredges the locks, dams, and channels both children depend on. Its funding decisions determine whether locks stay open [4][5].
• Environmental rules. The EPA's Vessel Incidental Discharge Act (VIDA) framework governs vessel discharges across both tiers, with emissions rules increasingly pushing electric-ferry investment [23].
• Tier-specific funding & finance. Freight partly funds its own infrastructure via the Inland Waterways Trust Fund (a diesel fuel tax paid by barge operators) [7]; passenger ferries draw on FHWA (Federal Highway Administration) Ferry Boat and FTA (Federal Transit Administration) Passenger/Rural Ferry grants, and cruise operators post financial-responsibility bonds with the Federal Maritime Commission to protect prepaid fares [24].

---

8. Consolidation

The level's federal concentration figures sit between the two children, weighted toward freight because freight is nine-tenths of the revenue: CR4 50.3%, CR8 62.9%, CR20 76.4%, CR50 90.2%, and an HHI of 735.4 — below the 1,000 line the U.S. Department of Justice's 2023 merger guidelines treat as "unconcentrated" [1][25].

But the level average hides two different structures:

• Freight is more concentrated and actively consolidating (CR4 54.9%, HHI 870.5) [2]. Scale helps absorb Subchapter M compliance, balance loaded/empty equipment, and win multi-year contracts. The clearest recent example is Marquette's parent agreeing to acquire Canal Barge in 2025 [8]; Kirby has long been a serial acquirer [8].
• Passenger is more fragmented and only selectively consolidating (CR4 31.6%, HHI 424) [3]. Hundreds of small ferry and excursion operators stay independent, but the overnight river-cruise sub-segment is a genuine oligopoly that just went through a shakeout — American Queen Voyages' February 2024 collapse consolidated share toward American Cruise Lines while Viking added capacity [17][18].

Caveat for both: NAICS 48321 is a statistical category, not an antitrust market — real competition can be far tighter by commodity, waterway, vessel type, or route than any national HHI suggests [25].

---

9. Risks

Shared across the level:

• Weather and river levels — the defining operational risk. The 2022 low water dropped the Mississippi at Memphis to a record −10.79 feet, backed up ~2,000 barges, and spiked spot rates as much as 400%, with recurrences in 2023 and 2025; the same droughts disrupt cruise itineraries [20]. Floods and ice cut both ways. Hard to hedge.
• Aging infrastructure. About 80% of the system's locks and dams are past their 50-year design life against a construction backlog near $7.5 billion; an unplanned lock failure can bottleneck a river for weeks [4].
• Capital intensity, leverage, and the U.S.-build premium make both children sensitive to interest rates and cost overruns [8][17].
• Labor. A persistent shortage of licensed mariners raises crew costs and caps how much fleet or how many boats an operator can crew.
• Poor disclosure. Private operators disclose little, public names blend inland activity with unrelated businesses, and government/nonemployer activity is undercounted — so clean, comparable data is scarce.

Freight-specific: the supply/rate cycle (over-building destroys capital for years); commodity and trade cyclicality (weak harvests, tariffs, secular coal decline) [6][9].

Passenger-specific: discretionary demand (recessions hit cruises and dinner boats); pandemic/health shocks (COVID-19 killed American Queen Voyages); subsidy and contract dependence plus hybrid-work erosion of commuter volume; and heightened safety/reputational sensitivity given an older cruise demographic [15][18].

---

10. How to invest, and the outlook

Public routes are thin and impure. The best listed handle on the whole level is Kirby (KEX) for freight — investors read its inland utilization and spot-rate commentary as the cleanest proxy for barge health — with ADM and Genesis (GEL, an MLP) as indirect freight exposure [8][10]. On the passenger side, Viking (VIK) trades on global cruise demand, not the Mississippi, and Kelsian (KLS) is remoter still [16]. There is no pure inland ETF; public analysis should focus on normalized cash generation, utilization/load factor, contract coverage, fleet age, capital spending, leverage, and the share of earnings actually tied to inland activity.

Private routes are where most of the level lives — and they differ by child:

• Freight: direct fleet ownership, PE control positions (the ACBL/Platinum model), family-business roll-ups (Marquette–Canal), captive-fleet economics, and vessel-secured private credit, plus the steadier fee layer of terminals, fleeting, and repair [8][11][14].
• Passenger: stakes in family- or sponsor-owned operators, PE/infrastructure positions in contracted ferry systems (the Hornblower model), vessel leasing, and — for public systems — municipal or public-agency debt rather than equity [16][18].

Near-term setup. Coming out of 2025 the freight picture was constructive: inland utilization ran low-to-mid-90s and rates firmed because years of restrained barge-building tightened the fleet — a favorable point in the supply cycle [8][9]. The passenger picture is two-speed: a flat, subsidy-dependent ferry backbone (watch federal FHWA/FTA grant rounds and hybrid-work commuter trends) alongside a river-cruise niche projected to grow ~14–15% a year through 2030, driven by new U.S.-built ship deliveries and an aging-affluent travel cohort [15][17][24].

Bottom line. Inland Water Transportation is one NAICS code stapling together two unlike businesses. Freight is ~92% of the money — a small-headcount, moat-protected, deeply cyclical bulk-logistics industry whose returns turn on the barge build/scrap cycle and the weather, and where public investors get essentially one good handle (Kirby) while private investors get the whole river. Passenger is the other ~8% — a mostly private-and-government business with a corridor-specific ferry backbone and one genuinely growing premium niche in American river cruising, but no clean listed play. For either child, the durable edge is the same: protected access (a moat, a route, a dock), disciplined capital spending against a slow-moving fleet, and contracts that properly pay for labor, maintenance, and the risk that the water misbehaves.

---

Sources

Drawn from the two child-industry primers (483211 Freight, 483212 Passenger) and our federal stats for this level.

1. U.S. Census Bureau, 2022 Economic Census & 2023 County Business Patterns, NAICS 48321 — Inland Water Transportation (rollup receipts, firms, establishments, employment, annual and Q1 payroll, concentration ratios CR4/CR8/CR20/CR50, HHI). Ground-truth figures for this level. https://data.census.gov/
2. U.S. Census Bureau, 2022 EC & 2023 CBP, NAICS 483211 — Inland Water Freight Transportation (child figures; CR4 54.9%, HHI 870.5). https://data.census.gov/
3. U.S. Census Bureau, 2022 EC & 2023 CBP, NAICS 483212 — Inland Water Passenger Transportation (child figures; CR4 31.6%, HHI 424; SBA size standard). https://data.census.gov/
4. American Society of Civil Engineers, 2025 Infrastructure Report Card — Inland Waterways (~12,000 network miles; ~465M tons / >$158B; ~80% of locks past 50-year life; ~$7.5B backlog). https://infrastructurereportcard.org/cat-item/inland-waterways-infrastructure/
5. U.S. Army Corps of Engineers, Waterborne Commerce Statistics Center (internal U.S. tonnage ~449M short tons, 2023). https://www.iwr.usace.army.mil/About/Technical-Centers/WCSC-Waterborne-Commerce-Statistics-Center/
6. U.S. Department of Agriculture, Agricultural Marketing Service, Inland Waterways / Grain Transportation Report (~60% of U.S. grain exports via the Mississippi system). https://www.ams.usda.gov/services/transportation-analysis/inland-waterways-report
7. Congressional Research Service, Inland Waterways Trust Fund (diesel fuel tax; construction cost-share). https://www.congress.gov/crs-product/IF10020
8. Kirby Corporation, 2025 Form 10-K and 2025 results (inland fleet ~1,100 tank barges / 266 towboats; segment structure; FY2025 revenue ~$3.4B; serial acquisitions); and The Waterways Journal, Redwood/Marquette to acquire Canal Barge (2025). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0000056047 · https://www.waterwaysjournal.net/
9. Kirby Corporation & industry commentary on the barge supply/build-scrap cycle, utilization, and rate dynamics (2025–2026 outlook). https://investors.kirbycorp.com/
10. Genesis Energy, L.P., Marine Transportation segment disclosures (inland fleet inside a diversified midstream MLP). https://www.genesisenergy.com/operations/marine-transportation
11. Archer-Daniels-Midland, ARTCO Barge and Stevedoring (captive covered-hopper and tank fleet; line-haul, fleeting, stevedoring, repair). https://www.adm.com/en-us/products-services/services/transportation-logistics/barge-stevedoring/
12. Congressional Research Service / U.S. Maritime Administration, Shipping Under the Jones Act (46 U.S.C. § 55102). https://www.congress.gov/crs-product/R45725
13. Ingram Marine Group / Ingram Industries, company profile (largest overall inland barge operator; privately held). https://ingrambarge.com/who-we-are/our-story/
14. American Commercial Barge Line / Platinum Equity, company profile and 2020 recapitalization (~3,550 barges, ~190 towboats). https://www.acbl.net/
15. Grand View Research, U.S. River Cruise Market Size, Share & Trends Report, 2030 (~$198M in 2024; ~14–15% projected CAGR). https://www.grandviewresearch.com/industry-analysis/us-river-cruise-market-report
16. Viking Holdings Ltd (NYSE: VIK), FY2025 filings and Mississippi time-charter disclosure; Kelsian Group (ASX: KLS) company overview; representative public ferry systems and private operators (NY Waterway, Blue & Gold Fleet, HMS Ferries). https://ir.viking.com/sec-filings · https://www.kelsian.com/
17. American Cruise Lines, company and newbuild releases (largest U.S. river-cruise line; U.S.-built fleet; Chesapeake Shipbuilding); post-2024 share consolidation. https://www.americancruiselines.com/why-american/about-us
18. The Maritime Executive / Hornblower Group, Hornblower recapitalization through 2024 bankruptcy (Strategic Value Partners majority; Crestview minority; City Ferry / NYC Ferry; American Queen Voyages closure). https://maritime-executive.com/ · https://www.hornblowercorp.com/
19. U.S. Bureau of Transportation Statistics, National Census of Ferry Operators (NCFO) (~200-plus operators; 100M+ boardings, spanning coastal and Great Lakes too). https://www.bts.gov/ncfo
20. NASA Earth Observatory / AccuWeather, Mississippi River drought and barge disruptions (Memphis −10.79 ft, Oct 2022; ~2,000 barges backed up; ~400% rate spike; 2023 and 2025 recurrences). https://science.nasa.gov/earth/earth-observatory/drought-and-barge-backups-on-the-mississippi-150504/
21. Passenger Vessel Services Act of 1886 (PVSA) — U.S. Customs and Border Protection guidance on passenger cabotage. https://www.cbp.gov/trade/programs-administration/entry-summary/jones-act
22. U.S. Coast Guard / Federal Register, Inspection of Towing Vessels (Subchapter M, July 2022) and small-passenger-vessel inspection (Subchapters K & T; six-passenger threshold). https://www.dco.uscg.mil/
23. U.S. Environmental Protection Agency, Vessel Incidental Discharge Act (VIDA). https://www.epa.gov/vessels-marinas-and-ports/vessel-incidental-discharge-act-vida
24. U.S. Department of Transportation, FHWA Ferry Boat Program; FTA Passenger Ferry & Rural Ferry Grant programs (~$220M modernization awards); U.S. Federal Maritime Commission passenger financial-responsibility rules. https://www.transit.dot.gov/grants/fta-ferry-programs · https://www.fmc.gov/resources-services/passenger-vessel-certification/
25. U.S. Department of Justice, Herfindahl-Hirschman Index / 2023 Merger Guidelines (unconcentrated below HHI 1,000; NAICS categories are not antitrust markets). https://www.justice.gov/atr/herfindahl-hirschman-index

Note: firm counts sum to 566 across the two children versus 565 reported for the level, a rounding artifact of the Economic Census; receipts, employment, establishments, and payroll reconcile to within rounding. Private and captive fleet counts are cited from company materials where available and are not consistently disclosed.