US Bridges

HAY-LACROSSE/7000 over Mud Flat Creek

FairPosted for load

Whitman County, Washington · 5.30 MI S SR 26 · Structure no. 079771000000000

Built
1920
105 years old, rebuilt 1958
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
40 ft
2 main spans
Daily traffic
65
2022 count
Owner
County
County Highway Agency

About this bridge

HAY-LACROSSE/7000 over Mud Flat Creek is a wood or timber stringer/multi-beam or girder carrying HAY-LACROSSE/7000 over Mud Flat Creek in Whitman County, Washington. It was built in 1920 and reconstructed in 1958, so it is 105 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 65 vehicles a day, roughly 19% of them trucks, projected to reach 72 by 2044. The structure is 40 ft (12.2 m) long and 26 ft wide. If it were closed, the detour would be 23 mi (37 km).

CarriesHAY-LACROSSE/7000
CrossesMud Flat Creek
Location5.30 MI S SR 26
RouteCounty Highway 70000
Coordinates46.72827, -117.85958
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating30 US tons
Inventory rating20.9 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 15
Structure length40 ft (12.2 m)
Longest span19 ft (5.8 m)
Deck width26 ft (7.9 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65 (2022)
Projected traffic72 by 2044
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed23 mi (37 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
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 1920, making it 105 years old in 2025. It was reconstructed in 1958.

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 65 vehicles per day (2022 count), of which roughly 19% 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 19 ft (5.8 m) and a deck 26 ft wide.

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

It is owned by the County Highway Agency.