US Bridges

ST John / 1090 over Branch Willow Creek

Good

Whitman County, Washington · 0.03 MI S Tensed Rd. · Structure no. 087975000000000

Built
2009
16 years old
Condition
Good
inspected January 2023
Type
Slab
Prestressed Concrete
Length
25 ft
1 main span
Daily traffic
66
2021 count
Owner
County
County Highway Agency

About this bridge

ST John / 1090 over Branch Willow Creek is a prestressed concrete slab carrying ST John / 1090 over Branch Willow Creek in Whitman County, Washington. It was built in 2009, so it is 16 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 66 vehicles a day, roughly 13% of them trucks, projected to reach 73 by 2041. The structure is 25 ft (7.6 m) long and 28 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesST John / 1090
CrossesBranch Willow Creek
Location0.03 MI S Tensed Rd.
RouteCounty Highway 10900
Coordinates47.1567, -117.06398
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 inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating30.8 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span24 ft (7.3 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic66 (2021)
Projected traffic73 by 2041
Trucks13%
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 statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST John / 1090 over Branch Willow Creek built?

It was built in 2009, making it 16 years old in 2025.

What condition is ST John / 1090 over Branch Willow 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 January 2023.

How much traffic does ST John / 1090 over Branch Willow Creek carry?

About 66 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is ST John / 1090 over Branch Willow Creek?

The structure is 25 ft (7.6 m) long with a longest span of 24 ft (7.3 m) and a deck 28 ft wide.

Who owns ST John / 1090 over Branch Willow Creek?

It is owned by the County Highway Agency.