Key Topics Covered in This Article
- How tugboat size impacts pricing structures
- Horsepower-based vs vessel-length billing models
- Rate differences across small, medium, and large tugs
- Harbor vs escort vs ocean tug cost scaling
- Market factors influencing tugboat pricing by size
When people ask for tugboat rates “by size,” they are usually picturing length (e.g., 70-foot vs. 120-foot tug). In actual port and towing billing, size is priced indirectly through the performance metrics that matter operationally:
Horsepower (HP) – a convenient proxy for capability and fuel burn
Bollard pull (metric tons or short tons) – the most direct proxy for pushing/towing force
Propulsion type tied to size class – conventional vs. tractor/ASD often correlates with larger, higher-performance tugs
Because of that, the best way to understand “rates by tug size” is to look at tariff structures that explicitly tier rates by HP or bollard pull, then translate those tiers into the “small / mid / large” language customers use.
Below is a practical guide to the most common size bands and the hourly rate patterns they produce, with published examples from multiple markets.
1) How tug “size” breaks down in the real world
Small tugs (roughly under ~3,000 HP)
Typical roles:
Line handling, light harbor moves, small barge shifts, standby work
Assisting smaller vessels or working in smaller ports with less demanding matrices
What tends to be true:
You are buying availability and local handling, not maximum power.
Hourly rates vary dramatically by market and minimum-hour rules.
Mid-size ship-assist tugs (roughly ~3,000–7,900 HP)
This is the “mainstream modern harbor tug” power band in many regions:
Strong enough for a large share of docking/undocking and terminal work
Often tractor/ASD designs, depending on port
A key point: some ports and operators explicitly price this band as the “standard tractor tug” class.
Large tugs (roughly 7,900+ HP) and high-bollard assets
Large tugs are priced as premium assets because they:
Meet higher pilot matrices for larger ships
Reduce risk in wind/current
Perform escort duties more credibly
In tariffs, this often shows up as:
A higher HP tier rate, and/or
A bollard pull surcharge when a high-capability tug is required.
2) Common hourly pricing model: “HP-tiered tractor tug rates”
One of the clearest public examples of “rates by size” is a rate sheet that explicitly tiers hourly tractor tug rates by horsepower.
Example: Puget Sound (Foss) – hourly rates by horsepower
Foss’s Puget Sound schedule lists hourly rates per tug with a 1-hour minimum, explicitly tiered by HP:
3,000 HP to 7,899 HP: $3,115 per hour
Greater than 7,900 HP: $4,375 per hour
This is a textbook demonstration of how “size” prices: the larger horsepower class carries a material premium on an hourly basis.
What to take away
Moving from “mid-size” to “large” (by HP) can add ~40%+ to the hourly rate in a published schedule, before any surcharges, delays, or after-hours premiums.
3) Another common model: “bollard pull tiers” within tractor tug pricing
In many industrial ports, “size” is priced as bollard pull, not HP. This is especially common where pilot matrices specify bollard pull thresholds.
Example: Houston-area tariffs – bollard pull cutoffs
Suderman & Young’s published tariff structure shows how tractor tug hourly pricing changes with bollard pull:
Base hourly charges referenced in the tariff are $1,893/hour, but when a tractor tug is required/requested:
$2,519/hour if tractor tug bollard pull is less than 95 metric tons
$2,839/hour if tractor tug bollard pull is 95 metric tons or more
That is “rates by tug size” in operational terms: a higher bollard pull class commands a higher hourly rate.
Why bollard pull pricing is so common
Because bollard pull is what pilots and terminals care about when they ask:
“Do we meet the matrix for this ship at this berth in these conditions?”
“Do we have enough margin if the vessel loses propulsion or the wind spikes?”
4) Smaller-market and “light” tug pricing looks very different
Not every port is a major ship-assist complex. In smaller markets, the hourly numbers can be much lower—especially for conventional tugs.
Example: Grays Harbor – conventional vs. tractor hourly
The Port of Grays Harbor tariff provides a simple comparison:
$475/hour per conventional tug
$950/hour per tug for ship-assist service (tractor/assist tug)
Even here, “size/capability” still drives price: the more capable ship-assist tug rate is roughly double the conventional tug rate.
5) Large and high-capability tugs are often priced via surcharges, not just higher base rates
In the highest-capability bands, many operators do not publish a totally separate “mega-tug hourly rate.” Instead, they apply a multiplier or surcharge when a high bollard pull tug is required.
Example: New York – high bollard pull surcharge
McAllister’s New York tariff states that if a tug with bollard pull exceeding 60 metric tons is specifically requested or required, a 50% surcharge applies to the docking/undocking rate per tug, in addition to the standard rate.
Example: Los Angeles/Long Beach – 90-metric-ton surcharge
Crowley’s LA/LB rate sheet notes that if a 90 metric ton bollard pull (or higher) assist tug is required/ordered by the pilot, a 50% surcharge applies.
What this means in practice
If your “standard” tug hourly is in the $2,500–$3,100 range in a major market, a 50% bollard pull surcharge effectively pushes the all-in rate for that tug into a materially higher bracket—without needing a separate published base rate for the highest class.
6) A usable “rate-by-size” cheat sheet (what people generally mean)
Because each port’s tariff and minimums differ, it is better to present rates as bands with published anchors, rather than pretending there’s one national average.
Small tugs (often < ~3,000 HP, lower bollard pull)
Smaller-market conventional tug example: $475/hour
Many ports won’t show explicit HP tiers for the smallest class; they may just publish “conventional” hourly.
Common reality: small tugs are often priced lower per hour, but minimums and travel time can dominate the invoice.
Mid-size harbor/tractor tugs (~3,000–7,900 HP)
Published HP-tier example: $3,115/hour for 3,000–7,899 HP tractor tugs (Puget Sound).
Published bollard pull example (tractor, <95t): $2,519/hour (Houston-area tariff).
Common reality: this band is the “default modern ship-assist tug” in many places.
Large tugs (7,900+ HP / high bollard pull)
Published HP-tier example: $4,375/hour for >7,900 HP tractor tugs (Puget Sound).
Published bollard pull example (tractor, ≥95t): $2,839/hour (Houston-area tariff).
High bollard pull surcharges: +50% in New York for >60t, and +50% in LA/LB for ≥90t.
Common reality: large/high-bollard assets are priced as risk-reduction tools and are often the scarcest capacity in the market.
7) Two points that matter more than “size” when estimating the invoice
A) Minimum hours and billing increments often matter more than the posted hourly rate
Many schedules impose:
1-hour, 2-hour, or longer minimums
billing in 15-minute, 30-minute, or 5-minute increments
So a “cheap hourly” tug can still produce a meaningful bill if the minimum is long or if running time to/from the station is included.
B) Job type can move the rate tier even for the same tug
The same “large” tug may bill at different effective hourly levels depending on:
standard assist vs. escort vs. emergency/dead-ship categories
whether a surcharge is triggered by the pilot matrix or competent authority
Bottom line
“Tug rates by size” are best understood as rates by horsepower and bollard pull class, not length. In published schedules, moving from mid-size to large horsepower bands can increase hourly rates substantially (for example, $3,115/hr to $4,375/hr in one Puget Sound schedule), and high bollard pull requirements frequently trigger 50% surcharges in major ports.
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