US Bridges

Wallowa Loop Road over Big Sheep Creek

Poor

Wallowa County, Oregon · 7.7 Miles Down FSR 39 · Structure no. 061602000001031

Built
1950
75 years old
Condition
Poor
inspected June 2024
Type
Slab
Concrete
Length
34 ft
1 main span
Daily traffic
225
2001 count
Owner
Federal
U.S. Forest Service

About this bridge

Wallowa Loop Road over Big Sheep Creek is a concrete slab carrying Wallowa Loop Road over Big Sheep Creek in Wallowa County, Oregon. It was built in 1950, so it is 75 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 225 vehicles a day, roughly 10% of them trucks, projected to reach 337 by 2045. The structure is 34 ft (10.4 m) long and 28 ft wide. If it were closed, the detour would be 59.7 mi (96 km).

CarriesWallowa Loop Road
CrossesBig Sheep Creek
Location7.7 Miles Down FSR 39
RouteFederal Lands Road 39000
StateOregon
Coordinates45.18157, -117.05371
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating48.1 US tons
Inventory rating29 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span31 ft (9.5 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2001)
Projected traffic337 by 2045
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed59.7 mi (96 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Wallowa Loop Road over Big Sheep Creek built?

It was built in 1950, making it 75 years old in 2025.

What condition is Wallowa Loop Road over Big Sheep Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.

How much traffic does Wallowa Loop Road over Big Sheep Creek carry?

About 225 vehicles per day (2001 count), of which roughly 10% are trucks.

How long is Wallowa Loop Road over Big Sheep Creek?

The structure is 34 ft (10.4 m) long with a longest span of 31 ft (9.5 m) and a deck 28 ft wide.

Who owns Wallowa Loop Road over Big Sheep Creek?

It is owned by the U.S. Forest Service.