US Bridges

CHAMBERS/9620 over Drainage Channel

FairPosted for load

Whitman County, Washington · 0.01 MI E SR 195 · Structure no. 080481000000000

Built
1958
67 years old
Condition
Fair
inspected December 2023
Type
Tee Beam
Concrete
Length
30 ft
1 main span
Daily traffic
50
2021 count
Owner
County
County Highway Agency

About this bridge

CHAMBERS/9620 over Drainage Channel is a concrete tee beam carrying CHAMBERS/9620 over Drainage Channel in Whitman County, Washington. It was built in 1958, so it is 67 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. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, roughly 25% of them trucks, projected to reach 51 by 2044. The structure is 30 ft (9.1 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesCHAMBERS/9620
CrossesDrainage Channel
Location0.01 MI E SR 195
RouteCounty Highway 96200
CountyWhitman County
StateWashington
Coordinates46.64553, -117.18712
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating29.3 US tons
Inventory rating21.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckOther
Main spans1
Design loadHS 15
Structure length30 ft (9.1 m)
Longest span29 ft (8.8 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2021)
Projected traffic51 by 2044
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$1.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was CHAMBERS/9620 over Drainage Channel built?

It was built in 1958, making it 67 years old in 2025.

What condition is CHAMBERS/9620 over Drainage Channel 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 December 2023.

How much traffic does CHAMBERS/9620 over Drainage Channel carry?

About 50 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is CHAMBERS/9620 over Drainage Channel?

The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 32 ft wide.

Who owns CHAMBERS/9620 over Drainage Channel?

It is owned by the County Highway Agency.