US Bridges

HATLEY/9550 over Union Flat Creek

FairPosted for load

Whitman County, Washington · 0.05 MI E Wawawai-Pullman · Structure no. 082787000000000

Built
1963
62 years old
Condition
Fair
inspected January 2025
Type
Tee Beam
Prestressed Concrete
Length
80 ft
1 main span
Daily traffic
10
2021 count
Owner
County
County Highway Agency

About this bridge

HATLEY/9550 over Union Flat Creek is a prestressed concrete tee beam carrying HATLEY/9550 over Union Flat Creek in Whitman County, Washington. It was built in 1963, so it is 62 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 10 vehicles a day, roughly 25% of them trucks, projected to reach 11 by 2042. The structure is 80 ft (24.4 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesHATLEY/9550
CrossesUnion Flat Creek
Location0.05 MI E Wawawai-Pullman
RouteCounty Highway 95500
CountyWhitman County
StateWashington
Coordinates46.676, -117.27253
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
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 rating32.2 US tons
Inventory rating24.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadH 20
Structure length80 ft (24.4 m)
Longest span78 ft (23.8 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2021)
Projected traffic11 by 2042
Trucks25%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was HATLEY/9550 over Union Flat Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is HATLEY/9550 over Union Flat Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2025.

How much traffic does HATLEY/9550 over Union Flat Creek carry?

About 10 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is HATLEY/9550 over Union Flat Creek?

The structure is 80 ft (24.4 m) long with a longest span of 78 ft (23.8 m) and a deck 16 ft wide.

Who owns HATLEY/9550 over Union Flat Creek?

It is owned by the County Highway Agency.