US Bridges

Manning Road over Cochran Creek

Poor

Linn County, Oregon · 0178 MI S Gr 412 · Structure no. 12626 041300178

Built
1961
64 years old
Condition
Poor
inspected October 2024
Type
Slab
Prestressed Concrete
Length
57 ft
3 main spans
Daily traffic
93
2021 count
Owner
County
County Highway Agency

About this bridge

Manning Road over Cochran Creek is a prestressed concrete slab carrying Manning Road over Cochran Creek in Linn County, Oregon. It was built in 1961, so it is 64 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. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 93 vehicles a day, projected to reach 124 by 2041. The structure is 57 ft (17.4 m) long and 25 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesManning Road
CrossesCochran Creek
Location0178 MI S Gr 412
RouteCounty Highway C0413
CountyLinn County
StateOregon
Coordinates44.46121, -123.02304
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 inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourUnknown foundation; not evaluated for scour
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span21 ft (6.4 m)
Deck width25 ft (7.5 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic93 (2021)
Projected traffic124 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Manning Road over Cochran Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is Manning Road over Cochran 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 October 2024.

How much traffic does Manning Road over Cochran Creek carry?

About 93 vehicles per day (2021 count).

How long is Manning Road over Cochran Creek?

The structure is 57 ft (17.4 m) long with a longest span of 21 ft (6.4 m) and a deck 25 ft wide.

Who owns Manning Road over Cochran Creek?

It is owned by the County Highway Agency.