US Bridges

WARNER/1100 over Willow Creek

Good

Whitman County, Washington · 5.73 MI NE SR 27 · Structure no. 081155000000000

Built
1981
44 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
389
2021 count
Owner
County
County Highway Agency

About this bridge

WARNER/1100 over Willow Creek is a prestressed concrete stringer/multi-beam or girder carrying WARNER/1100 over Willow Creek in Whitman County, Washington. It was built in 1981, so it is 44 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 389 vehicles a day, roughly 18% of them trucks, projected to reach 183 by 2044. The structure is 30 ft (9.1 m) long and 28 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

CarriesWARNER/1100
CrossesWillow Creek
Location5.73 MI NE SR 27
RouteCounty Highway 11000
Coordinates47.15328, -117.10933
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum 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 rating32.8 US tons
Inventory rating25.7 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span29 ft (8.8 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic389 (2021)
Projected traffic183 by 2044
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 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 WARNER/1100 over Willow Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is WARNER/1100 over 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 November 2023.

How much traffic does WARNER/1100 over Willow Creek carry?

About 389 vehicles per day (2021 count), of which roughly 18% are trucks.

How long is WARNER/1100 over Willow Creek?

The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 28 ft wide.

Who owns WARNER/1100 over Willow Creek?

It is owned by the County Highway Agency.