US Bridges

HAY-LACROSSE/7000 over Mud Flat Creek

Fair

Whitman County, Washington · 9.24 MI S SR 26 · Structure no. 083041000000000

Built
1970
55 years old
Condition
Fair
inspected November 2024
Type
Tee Beam
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
107
2020 count
Owner
County
County Highway Agency

About this bridge

HAY-LACROSSE/7000 over Mud Flat Creek is a prestressed concrete tee beam carrying HAY-LACROSSE/7000 over Mud Flat Creek in Whitman County, Washington. It was built in 1970, so it is 55 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.

It carries about 107 vehicles a day, roughly 25% of them trucks, projected to reach 109 by 2039. The structure is 40 ft (12.2 m) long and 30 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

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CarriesHAY-LACROSSE/7000
CrossesMud Flat Creek
Location9.24 MI S SR 26
RouteCounty Highway 70000
CountyWhitman County
StateWashington
Coordinates46.68182, -117.9102
Functional classRural Major 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41.1 US tons
Inventory rating26.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic107 (2020)
Projected traffic109 by 2039
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was HAY-LACROSSE/7000 over Mud Flat Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is HAY-LACROSSE/7000 over Mud 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 November 2024.

How much traffic does HAY-LACROSSE/7000 over Mud Flat Creek carry?

About 107 vehicles per day (2020 count), of which roughly 25% are trucks.

How long is HAY-LACROSSE/7000 over Mud Flat Creek?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 30 ft wide.

Who owns HAY-LACROSSE/7000 over Mud Flat Creek?

It is owned by the County Highway Agency.