US Bridges

Anderson Road over Columbia Plateau Trail

Fair

Spokane County, Washington · 1.0 E Cheney-Spok · Structure no. 080767000000000

Built
1971
54 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
76 ft
1 main span
Daily traffic
221
2020 count
Owner
County
County Highway Agency

About this bridge

Anderson Road over Columbia Plateau Trail is a prestressed concrete stringer/multi-beam or girder carrying Anderson Road over Columbia Plateau Trail in Spokane County, Washington. It was built in 1971, so it is 54 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 221 vehicles a day, roughly 16% of them trucks, projected to reach 318 by 2042. The structure is 76 ft (23.2 m) long and 28 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesAnderson Road
CrossesColumbia Plateau Trail
Location1.0 E Cheney-Spok
RouteCounty Highway 20
CountySpokane County
StateWashington
Coordinates47.50758, -117.52832
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating25.4 US tons
Inventory rating19.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span74 ft (22.6 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic221 (2020)
Projected traffic318 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesPedestrian / bicycle
Detour if closed11.8 mi (19 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$3.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Anderson Road over Columbia Plateau Trail built?

It was built in 1971, making it 54 years old in 2025.

What condition is Anderson Road over Columbia Plateau Trail 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 August 2024.

How much traffic does Anderson Road over Columbia Plateau Trail carry?

About 221 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is Anderson Road over Columbia Plateau Trail?

The structure is 76 ft (23.2 m) long with a longest span of 74 ft (22.6 m) and a deck 28 ft wide.

Who owns Anderson Road over Columbia Plateau Trail?

It is owned by the County Highway Agency.