US Bridges

Adams RD over Wildhorse Creek

Fair

Umatilla County, Oregon · 2.6 MI N of HWY 11 · Structure no. 59C356097300259

Built
1924
101 years old
Condition
Fair
inspected July 2023
Type
Truss - Thru
Steel
Length
82 ft
1 main span
Daily traffic
200
2020 count
Owner
County
County Highway Agency

About this bridge

Adams RD over Wildhorse Creek is a steel truss - thru carrying Adams RD over Wildhorse Creek in Umatilla County, Oregon. It was built in 1924, so it is 101 years old, older than the Oregon average of 49.9 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 200 vehicles a day, roughly 10% of them trucks, projected to reach 232 by 2025. The structure is 82 ft (25 m) long and 20 ft wide. If it were closed, the detour would be 9.3 mi (15 km).

Location

Open in Google Maps
CarriesAdams RD
CrossesWildhorse Creek
Location2.6 MI N of HWY 11
RouteCounty Highway 0
CountyUmatilla County
StateOregon
Coordinates45.70437, -118.71471
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating20.7 US tons
Inventory rating16.1 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length82 ft (25 m)
Longest span80 ft (24.4 m)
Deck width20 ft (6.2 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2020)
Projected traffic232 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.3 mi (15 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$420,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Adams RD over Wildhorse Creek built?

It was built in 1924, making it 101 years old in 2025.

What condition is Adams RD over Wildhorse 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 July 2023.

How much traffic does Adams RD over Wildhorse Creek carry?

About 200 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Adams RD over Wildhorse Creek?

The structure is 82 ft (25 m) long with a longest span of 80 ft (24.4 m) and a deck 20 ft wide.

Who owns Adams RD over Wildhorse Creek?

It is owned by the County Highway Agency.