US Bridges

US 12 over Snake R. & Bn RY

Fair

Franklin County, Washington · 2.9 E JCT I-182 · Structure no. 0012800A0000000

Built
1986
39 years old
Condition
Fair
inspected April 2024
Type
Truss - Thru
Steel Continuous
Length
1,780 ft
3 main spans
Daily traffic
13,260
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Snake R. & Bn RY is a steel continuous truss - thru carrying US 12 over Snake R. & Bn RY in Franklin County, Washington. It was built in 1986, so it is 39 years old, younger 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 13,260 vehicles a day, roughly 18% of them trucks, projected to reach 16,539 by 2039. The structure is 1,780 ft (542.5 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 12
CrossesSnake R. & Bn RY
Location2.9 E JCT I-182
RouteU.S. Route 12
CountyFranklin County
StateWashington
Coordinates46.21739, -119.02522
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
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 Continuous
DeckConcrete, cast-in-place
Main spans3 (+7 approach)
Design loadHS 20 + Mod
Structure length1,780 ft (542.5 m)
Longest span425 ft (129.5 m)
Deck width48 ft (14.7 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic13,260 (2023)
Projected traffic16,539 by 2039
Trucks18%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesRailroad and waterway
Detour if closed1.2 mi (2 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$35.5 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 12 over Snake R. & Bn RY built?

It was built in 1986, making it 39 years old in 2025.

What condition is US 12 over Snake R. & Bn RY 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 Snake R. & Bn RY carry?

About 13,260 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is US 12 over Snake R. & Bn RY?

The structure is 1,780 ft (542.5 m) long with a longest span of 425 ft (129.5 m) and a deck 48 ft wide.

Who owns US 12 over Snake R. & Bn RY?

It is owned by the State Highway Agency.