US Bridges

Barbouillat Street over Overflow

Good

Thurston County, Washington · 0.5 West Mima Road · Structure no. 086524000000000

Built
1999
26 years old
Condition
Good
inspected May 2024
Type
Slab
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
50
2020 count
Owner
County
County Highway Agency

About this bridge

Barbouillat Street over Overflow is a prestressed concrete slab carrying Barbouillat Street over Overflow in Thurston County, Washington. It was built in 1999, so it is 26 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 50 vehicles a day, roughly 5% of them trucks, projected to reach 80 by 2042. The structure is 31 ft (9.4 m) long and 32 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesBarbouillat Street
CrossesOverflow
Location0.5 West Mima Road
RouteCounty Highway 10261
Coordinates46.88549, -123.06088
Functional classRural Local

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 inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2020)
Projected traffic80 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$442,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Barbouillat Street over Overflow built?

It was built in 1999, making it 26 years old in 2025.

What condition is Barbouillat Street over Overflow 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 May 2024.

How much traffic does Barbouillat Street over Overflow carry?

About 50 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Barbouillat Street over Overflow?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns Barbouillat Street over Overflow?

It is owned by the County Highway Agency.