US Bridges

US 12 over Black River

Fair

Grays Harbor County, Washington · 16.3 E JCT SR 8 · Structure no. 0001576C0000000

Built
1932
93 years old
Condition
Fair
inspected April 2024
Type
Truss - Thru
Steel
Length
169 ft
1 main span
Daily traffic
7,629
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Black River is a steel truss - thru carrying US 12 over Black River in Grays Harbor County, Washington. It was built in 1932, so it is 93 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.

It carries about 7,629 vehicles a day, roughly 16% of them trucks, projected to reach 8,733 by 2039. The structure is 169 ft (51.5 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesUS 12
CrossesBlack River
Location16.3 E JCT SR 8
RouteU.S. Route 12
CountyGrays Harbor County
StateWashington
Coordinates46.83029, -123.18614
Functional classRural Principal Arterial - Other

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41 US tons
Inventory rating24 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 15
Structure length169 ft (51.5 m)
Longest span104 ft (31.7 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,629 (2023)
Projected traffic8,733 by 2039
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over Black River built?

It was built in 1932, making it 93 years old in 2025.

What condition is US 12 over Black River 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 April 2024.

How much traffic does US 12 over Black River carry?

About 7,629 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is US 12 over Black River?

The structure is 169 ft (51.5 m) long with a longest span of 104 ft (31.7 m) and a deck 26 ft wide.

Who owns US 12 over Black River?

It is owned by the State Highway Agency.