US Bridges

Flat CREEK/6010 over Union Flat Creek

Fair

Whitman County, Washington · 1.07 MI E Winona South · Structure no. 082597000000000

Built
1965
60 years old
Condition
Fair
inspected October 2024
Type
Tee Beam
Prestressed Concrete
Length
68 ft
1 main span
Daily traffic
65
2020 count
Owner
County
County Highway Agency

About this bridge

Flat CREEK/6010 over Union Flat Creek is a prestressed concrete tee beam carrying Flat CREEK/6010 over Union Flat Creek in Whitman County, Washington. It was built in 1965, so it is 60 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 65 vehicles a day, roughly 25% of them trucks, projected to reach 66 by 2039. The structure is 68 ft (20.7 m) long and 28 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesFlat CREEK/6010
CrossesUnion Flat Creek
Location1.07 MI E Winona South
RouteCounty Highway 60100
CountyWhitman County
StateWashington
Coordinates46.85507, -117.83688
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
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 alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadH 20
Structure length68 ft (20.7 m)
Longest span67 ft (20.4 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65 (2020)
Projected traffic66 by 2039
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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$2.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Flat CREEK/6010 over Union Flat Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is Flat CREEK/6010 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 October 2024.

How much traffic does Flat CREEK/6010 over Union Flat Creek carry?

About 65 vehicles per day (2020 count), of which roughly 25% are trucks.

How long is Flat CREEK/6010 over Union Flat Creek?

The structure is 68 ft (20.7 m) long with a longest span of 67 ft (20.4 m) and a deck 28 ft wide.

Who owns Flat CREEK/6010 over Union Flat Creek?

It is owned by the County Highway Agency.