US Bridges

LITTLE/9170 over Union Flat Creek

Good

Whitman County, Washington · 3.10 MI SW SR 195 · Structure no. 081291000000000

Built
1980
45 years old
Condition
Good
inspected January 2025
Type
Tee Beam
Prestressed Concrete
Length
100 ft
1 main span
Daily traffic
10
2021 count
Owner
County
County Highway Agency

About this bridge

LITTLE/9170 over Union Flat Creek is a prestressed concrete tee beam carrying LITTLE/9170 over Union Flat Creek in Whitman County, Washington. It was built in 1980, so it is 45 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 10 vehicles a day, roughly 40% of them trucks, projected to reach 11 by 2042. The structure is 100 ft (30.5 m) long and 26 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesLITTLE/9170
CrossesUnion Flat Creek
Location3.10 MI SW SR 195
RouteCounty Highway 91700
Coordinates46.62028, -117.23005
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating47.8 US tons
Inventory rating23.3 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span98 ft (30 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2021)
Projected traffic11 by 2042
Trucks40%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was LITTLE/9170 over Union Flat Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is LITTLE/9170 over Union Flat 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 2025.

How much traffic does LITTLE/9170 over Union Flat Creek carry?

About 10 vehicles per day (2021 count), of which roughly 40% are trucks.

How long is LITTLE/9170 over Union Flat Creek?

The structure is 100 ft (30.5 m) long with a longest span of 98 ft (30 m) and a deck 26 ft wide.

Who owns LITTLE/9170 over Union Flat Creek?

It is owned by the County Highway Agency.