US Bridges

NE 112th Ave. over Salmon Creek

FairPosted for load

Clark County, Washington · 0.2 N NE 156 ST · Structure no. 081866000000000

Built
1960
65 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
43 ft
2 main spans
Daily traffic
20
2016 count
Owner
County
County Highway Agency

About this bridge

NE 112th Ave. over Salmon Creek is a steel stringer/multi-beam or girder carrying NE 112th Ave. over Salmon Creek in Clark County, Washington. It was built in 1960, so it is 65 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. Its operating status is: posted for load restriction.

It carries about 20 vehicles a day, roughly 13% of them trucks, projected to reach 50 by 2038. The structure is 43 ft (13.1 m) long and 13 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesNE 112th Ave.
CrossesSalmon Creek
Location0.2 N NE 156 ST
RouteCounty Highway 50360
CountyClark County
StateWashington
Coordinates45.73782, -122.55773
Functional classRural Major Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating29.3 US tons
Inventory rating22.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length43 ft (13.1 m)
Longest span21 ft (6.4 m)
Deck width13 ft (4.1 m)
Roadway width13 ft (3.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2016)
Projected traffic50 by 2038
Trucks13%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was NE 112th Ave. over Salmon Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is NE 112th Ave. over Salmon 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 NE 112th Ave. over Salmon Creek carry?

About 20 vehicles per day (2016 count), of which roughly 13% are trucks.

How long is NE 112th Ave. over Salmon Creek?

The structure is 43 ft (13.1 m) long with a longest span of 21 ft (6.4 m) and a deck 13 ft wide.

Who owns NE 112th Ave. over Salmon Creek?

It is owned by the County Highway Agency.