US Bridges

County RD 12A over Cow Creek

FairPosted for load

Douglas County, Oregon · 2.5 MI E of Glendale @ I5 · Structure no. 19C337 12A 011

Built
1952
73 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
441 ft
6 main spans
Daily traffic
1,451
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 12A over Cow Creek is a steel continuous stringer/multi-beam or girder carrying County RD 12A over Cow Creek in Douglas County, Oregon. It was built in 1952, so it is 73 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. Its operating status is: posted for load restriction.

It carries about 1,451 vehicles a day, roughly 5% of them trucks, projected to reach 1,641 by 2025. The structure is 441 ft (134.4 m) long and 22 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesCounty RD 12A
CrossesCow Creek
Location2.5 MI E of Glendale @ I5
RouteCounty Highway 0A380
CountyDouglas County
StateOregon
Coordinates42.74825, -123.37236
Functional classRural Major Collector

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 inspectionJune 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating7.5 US tons
Inventory rating5.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckOpen grating
Main spans6
Design loadH 20
Structure length441 ft (134.4 m)
Longest span78 ft (23.8 m)
Deck width22 ft (6.6 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,451 (2020)
Projected traffic1,641 by 2025
Trucks5%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$2.3 million
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 12A over Cow Creek built?

It was built in 1952, making it 73 years old in 2025.

What condition is County RD 12A over Cow 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 June 2024.

How much traffic does County RD 12A over Cow Creek carry?

About 1,451 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is County RD 12A over Cow Creek?

The structure is 441 ft (134.4 m) long with a longest span of 78 ft (23.8 m) and a deck 22 ft wide.

Who owns County RD 12A over Cow Creek?

It is owned by the County Highway Agency.