US Bridges

SR 31 over Cedar Creek

Fair

Pend Oreille County, Washington · 4.1 N JCT SR 20 · Structure no. 0003073B0000000

Built
1946
79 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Concrete Continuous
Length
147 ft
3 main spans
Daily traffic
1,960
2023 count
Owner
State
State Highway Agency

About this bridge

SR 31 over Cedar Creek is a concrete continuous tee beam carrying SR 31 over Cedar Creek in Pend Oreille County, Washington. It was built in 1946, so it is 79 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 1,960 vehicles a day, roughly 13% of them trucks, projected to reach 2,034 by 2039. The structure is 147 ft (44.8 m) long and 36 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR 31
CrossesCedar Creek
Location4.1 N JCT SR 20
RouteState Highway 31
CountyPend Oreille County
StateWashington
Coordinates48.743, -117.41786
Functional classRural Minor Arterial

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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating71 US tons
Inventory rating43 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length147 ft (44.8 m)
Longest span60 ft (18.3 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,960 (2023)
Projected traffic2,034 by 2039
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 31 over Cedar Creek built?

It was built in 1946, making it 79 years old in 2025.

What condition is SR 31 over Cedar 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 August 2024.

How much traffic does SR 31 over Cedar Creek carry?

About 1,960 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is SR 31 over Cedar Creek?

The structure is 147 ft (44.8 m) long with a longest span of 60 ft (18.3 m) and a deck 36 ft wide.

Who owns SR 31 over Cedar Creek?

It is owned by the State Highway Agency.