US Bridges

Winona SOUTH/6000 over Union Flat Creek

Good

Whitman County, Washington · 8.18 MI SW Endicott · Structure no. 087372000000000

Built
2005
20 years old
Condition
Good
inspected December 2023
Type
Tee Beam
Prestressed Concrete
Length
128 ft
1 main span
Daily traffic
282
2021 count
Owner
County
County Highway Agency

About this bridge

Winona SOUTH/6000 over Union Flat Creek is a prestressed concrete tee beam carrying Winona SOUTH/6000 over Union Flat Creek in Whitman County, Washington. It was built in 2005, so it is 20 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 282 vehicles a day, roughly 25% of them trucks, projected to reach 288 by 2044. The structure is 128 ft (39 m) long and 34 ft wide. If it were closed, the detour would be 41 mi (66 km).

CarriesWinona SOUTH/6000
CrossesUnion Flat Creek
Location8.18 MI SW Endicott
RouteCounty Highway 60000
Coordinates46.85868, -117.85798
Functional classRural Major 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 protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating32.2 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length128 ft (39 m)
Longest span126 ft (38.3 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic282 (2021)
Projected traffic288 by 2044
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed41 mi (66 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$5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Winona SOUTH/6000 over Union Flat Creek built?

It was built in 2005, making it 20 years old in 2025.

What condition is Winona SOUTH/6000 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 December 2023.

How much traffic does Winona SOUTH/6000 over Union Flat Creek carry?

About 282 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is Winona SOUTH/6000 over Union Flat Creek?

The structure is 128 ft (39 m) long with a longest span of 126 ft (38.3 m) and a deck 34 ft wide.

Who owns Winona SOUTH/6000 over Union Flat Creek?

It is owned by the County Highway Agency.