US Bridges

Harrison Road over Cochran Creek

Poor

Linn County, Oregon · 050 MI NW Brownsville · Structure no. 12632 001800171

Built
1972
53 years old
Condition
Poor
inspected October 2024
Type
Slab
Prestressed Concrete
Length
32 ft
1 main span
Daily traffic
618
2021 count
Owner
County
County Highway Agency

About this bridge

Harrison Road over Cochran Creek is a prestressed concrete slab carrying Harrison Road over Cochran Creek in Linn County, Oregon. It was built in 1972, so it is 53 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 618 vehicles a day, roughly 15% of them trucks, projected to reach 772 by 2041. The structure is 32 ft (9.8 m) long and 36 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesHarrison Road
CrossesCochran Creek
Location050 MI NW Brownsville
RouteCounty Highway C0018
CountyLinn County
StateOregon
Coordinates44.45657, -123.01861
Functional classRural Minor Collector

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 protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45.7 US tons
Inventory rating35.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width36 ft (10.9 m)
Roadway width34 ft (10.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic618 (2021)
Projected traffic772 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$164,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Harrison Road over Cochran Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is Harrison 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 Harrison Road over Cochran Creek carry?

About 618 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is Harrison Road over Cochran Creek?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 36 ft wide.

Who owns Harrison Road over Cochran Creek?

It is owned by the County Highway Agency.