US Bridges

SR 12 over Np RY

Good

Grays Harbor County, Washington · 10.0 E JCT SR 107 · Structure no. 0007327A0000000

Built
1964
61 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
134 ft
3 main spans
Daily traffic
12,077
2023 count
Owner
State
State Highway Agency

About this bridge

SR 12 over Np RY is a prestressed concrete stringer/multi-beam or girder carrying SR 12 over Np RY in Grays Harbor County, Washington. It was built in 1964, so it is 61 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 12,077 vehicles a day, roughly 10% of them trucks, projected to reach 13,699 by 2039. The structure is 134 ft (40.8 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSR 12
CrossesNp RY
Location10.0 E JCT SR 107
RouteU.S. Route 12
Coordinates47.00283, -123.39533
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86 US tons
Inventory rating51 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length134 ft (40.8 m)
Longest span42 ft (12.8 m)
Deck width35 ft (10.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,077 (2023)
Projected traffic13,699 by 2039
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

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$2.5 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 12 over Np RY built?

It was built in 1964, making it 61 years old in 2025.

What condition is SR 12 over Np RY 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 September 2023.

How much traffic does SR 12 over Np RY carry?

About 12,077 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SR 12 over Np RY?

The structure is 134 ft (40.8 m) long with a longest span of 42 ft (12.8 m) and a deck 35 ft wide.

Who owns SR 12 over Np RY?

It is owned by the State Highway Agency.