US Bridges

Big ALKALI/7005 over Alkali Flat Creek

Fair

Whitman County, Washington · 1.36 MI E Little Goose Dm · Structure no. 083160000000000

Built
1981
44 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
136
2020 count
Owner
County
County Highway Agency

About this bridge

Big ALKALI/7005 over Alkali Flat Creek is a prestressed concrete stringer/multi-beam or girder carrying Big ALKALI/7005 over Alkali Flat Creek in Whitman County, Washington. It was built in 1981, so it is 44 years old, younger 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 136 vehicles a day, roughly 25% of them trucks, projected to reach 136 by 2039. The structure is 45 ft (13.7 m) long and 28 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesBig ALKALI/7005
CrossesAlkali Flat Creek
Location1.36 MI E Little Goose Dm
RouteCounty Highway 70050
CountyWhitman County
StateWashington
Coordinates46.67732, -117.88382
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
Deck7 GoodSome minor problems.
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 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating24.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span44 ft (13.4 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic136 (2020)
Projected traffic136 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$2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Big ALKALI/7005 over Alkali Flat Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is Big ALKALI/7005 over Alkali 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 Big ALKALI/7005 over Alkali Flat Creek carry?

About 136 vehicles per day (2020 count), of which roughly 25% are trucks.

How long is Big ALKALI/7005 over Alkali Flat Creek?

The structure is 45 ft (13.7 m) long with a longest span of 44 ft (13.4 m) and a deck 28 ft wide.

Who owns Big ALKALI/7005 over Alkali Flat Creek?

It is owned by the County Highway Agency.