US Bridges

Mud Hollow RD over Mud Hollow Canyon

FairPosted for load

Sherman County, Oregon · 1.9 MI W of HWY 97 · Structure no. 55C010052800220

Built
1930
95 years old, rebuilt 1958
Condition
Fair
inspected August 2024
Type
Slab
Concrete Continuous
Length
31 ft
2 main spans
Daily traffic
61
2020 count
Owner
County
County Highway Agency

About this bridge

Mud Hollow RD over Mud Hollow Canyon is a concrete continuous slab carrying Mud Hollow RD over Mud Hollow Canyon in Sherman County, Oregon. It was built in 1930 and reconstructed in 1958, so it is 95 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 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 other load-capacity restriction.

It carries about 61 vehicles a day, roughly 10% of them trucks, projected to reach 71 by 2025. The structure is 31 ft (9.4 m) long and 22 ft wide. If it were closed, the detour would be 4.3 mi (7 km).

CarriesMud Hollow RD
CrossesMud Hollow Canyon
Location1.9 MI W of HWY 97
RouteCounty Highway 0
StateOregon
Coordinates45.60756, -120.76177
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.
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 other load-capacity restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.7 US tons
Inventory rating24.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length31 ft (9.4 m)
Longest span15 ft (4.6 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic61 (2020)
Projected traffic71 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed4.3 mi (7 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mud Hollow RD over Mud Hollow Canyon built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1958.

What condition is Mud Hollow RD over Mud Hollow Canyon 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 Mud Hollow RD over Mud Hollow Canyon carry?

About 61 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Mud Hollow RD over Mud Hollow Canyon?

The structure is 31 ft (9.4 m) long with a longest span of 15 ft (4.6 m) and a deck 22 ft wide.

Who owns Mud Hollow RD over Mud Hollow Canyon?

It is owned by the County Highway Agency.