US Bridges

Mt. Adams Hwy. over Trout Creek

Fair

Klickitat County, Washington · 0.2 N JCT SR 141 · Structure no. 083078000000000

Built
1956
69 years old
Condition
Fair
inspected September 2024
Type
Slab
Concrete Continuous
Length
113 ft
3 main spans
Daily traffic
739
2022 count
Owner
County
County Highway Agency

About this bridge

Mt. Adams Hwy. over Trout Creek is a concrete continuous slab carrying Mt. Adams Hwy. over Trout Creek in Klickitat County, Washington. It was built in 1956, so it is 69 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.

It carries about 739 vehicles a day, roughly 47% of them trucks, projected to reach 920 by 2044. The structure is 113 ft (34.4 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMt. Adams Hwy.
CrossesTrout Creek
Location0.2 N JCT SR 141
RouteCounty Highway 17200
CountyKlickitat County
StateWashington
Coordinates45.9989, -121.528
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 protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length113 ft (34.4 m)
Longest span50 ft (15.2 m)
Deck width30 ft (9.2 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic739 (2022)
Projected traffic920 by 2044
Trucks47%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$4.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mt. Adams Hwy. over Trout Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is Mt. Adams Hwy. over Trout 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 September 2024.

How much traffic does Mt. Adams Hwy. over Trout Creek carry?

About 739 vehicles per day (2022 count), of which roughly 47% are trucks.

How long is Mt. Adams Hwy. over Trout Creek?

The structure is 113 ft (34.4 m) long with a longest span of 50 ft (15.2 m) and a deck 30 ft wide.

Who owns Mt. Adams Hwy. over Trout Creek?

It is owned by the County Highway Agency.