US Bridges

US 101 over Prairie CR

Good

Grays Harbor County, Washington · 41.7 N JCT SR 109 · Structure no. 0004740A0000000

Built
1954
71 years old, rebuilt 1985
Condition
Good
inspected August 2023
Type
Tee Beam
Concrete
Length
102 ft
3 main spans
Daily traffic
1,434
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Prairie CR is a concrete tee beam carrying US 101 over Prairie CR in Grays Harbor County, Washington. It was built in 1954 and reconstructed in 1985, so it is 71 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,434 vehicles a day, roughly 24% of them trucks, projected to reach 1,815 by 2039. The structure is 102 ft (31.1 m) long and 39 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesUS 101
CrossesPrairie CR
Location41.7 N JCT SR 109
RouteU.S. Route 101
CountyGrays Harbor County
StateWashington
Coordinates47.47689, -123.92947
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43 US tons
Inventory rating26 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length102 ft (31.1 m)
Longest span70 ft (21.3 m)
Deck width39 ft (12 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,434 (2023)
Projected traffic1,815 by 2039
Trucks24%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes

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$1.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 101 over Prairie CR built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 1985.

What condition is US 101 over Prairie CR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does US 101 over Prairie CR carry?

About 1,434 vehicles per day (2023 count), of which roughly 24% are trucks.

How long is US 101 over Prairie CR?

The structure is 102 ft (31.1 m) long with a longest span of 70 ft (21.3 m) and a deck 39 ft wide.

Who owns US 101 over Prairie CR?

It is owned by the State Highway Agency.