US Bridges

Steiacoom Road over Hartman Creek

Good

Thurston County, Washington · 1 Mile E Duterrow Int · Structure no. 086641000000000

Built
2001
24 years old
Condition
Good
inspected September 2023
Type
Slab
Prestressed Concrete
Length
29 ft
1 main span
Daily traffic
1,001
2020 count
Owner
County
County Highway Agency

About this bridge

Steiacoom Road over Hartman Creek is a prestressed concrete slab carrying Steiacoom Road over Hartman Creek in Thurston County, Washington. It was built in 2001, so it is 24 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,001 vehicles a day, roughly 10% of them trucks, projected to reach 1,548 by 2042. The structure is 29 ft (8.8 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesSteiacoom Road
CrossesHartman Creek
Location1 Mile E Duterrow Int
RouteCounty Highway 14830
Coordinates47.05163, -122.72139
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86 US tons
Inventory rating51 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span28 ft (8.5 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,001 (2020)
Projected traffic1,548 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$1.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Steiacoom Road over Hartman Creek built?

It was built in 2001, making it 24 years old in 2025.

What condition is Steiacoom Road over Hartman Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Steiacoom Road over Hartman Creek carry?

About 1,001 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Steiacoom Road over Hartman Creek?

The structure is 29 ft (8.8 m) long with a longest span of 28 ft (8.5 m) and a deck 32 ft wide.

Who owns Steiacoom Road over Hartman Creek?

It is owned by the County Highway Agency.