US Bridges

Steamboat Is. Rd. over Totten Inlet

Fair

Thurston County, Washington · Steamboat Island · Structure no. 084547000000000

Built
1982
43 years old
Condition
Fair
inspected April 2023
Type
Slab
Prestressed Concrete
Length
706 ft
24 main spans
Daily traffic
146
2020 count
Owner
County
County Highway Agency

About this bridge

Steamboat Is. Rd. over Totten Inlet is a prestressed concrete slab carrying Steamboat Is. Rd. over Totten Inlet in Thurston County, Washington. It was built in 1982, so it is 43 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 146 vehicles a day, roughly 10% of them trucks, projected to reach 226 by 2042. The structure is 706 ft (215.2 m) long and 20 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesSteamboat Is. Rd.
CrossesTotten Inlet
LocationSteamboat Island
RouteCounty Highway 14810
CountyThurston County
StateWashington
Coordinates47.18195, -122.94041
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37 US tons
Inventory rating28 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans24
Design loadHL 93
Structure length706 ft (215.2 m)
Longest span29 ft (8.8 m)
Deck width20 ft (6.1 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic146 (2020)
Projected traffic226 by 2042
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$17.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Steamboat Is. Rd. over Totten Inlet built?

It was built in 1982, making it 43 years old in 2025.

What condition is Steamboat Is. Rd. over Totten Inlet in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does Steamboat Is. Rd. over Totten Inlet carry?

About 146 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Steamboat Is. Rd. over Totten Inlet?

The structure is 706 ft (215.2 m) long with a longest span of 29 ft (8.8 m) and a deck 20 ft wide.

Who owns Steamboat Is. Rd. over Totten Inlet?

It is owned by the County Highway Agency.