US Bridges

County RD 12B over Cow Creek

Fair

Douglas County, Oregon · At Glendale · Structure no. 19C489 12B 002

Built
1990
35 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Prestressed Concrete
Length
185 ft
2 main spans
Daily traffic
2,644
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 12B over Cow Creek is a prestressed concrete tee beam carrying County RD 12B over Cow Creek in Douglas County, Oregon. It was built in 1990, so it is 35 years old, younger 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.

It carries about 2,644 vehicles a day, roughly 15% of them trucks, projected to reach 2,989 by 2025. The structure is 185 ft (56.4 m) long and 50 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesCounty RD 12B
CrossesCow Creek
LocationAt Glendale
RouteCounty Highway C012B
CountyDouglas County
StateOregon
Coordinates42.74011, -123.41684
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71 US tons
Inventory rating42 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadHS 25 or greater
Structure length185 ft (56.4 m)
Longest span91 ft (27.7 m)
Deck width50 ft (15.2 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,644 (2020)
Projected traffic2,989 by 2025
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 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 County RD 12B over Cow Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is County RD 12B 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 2023.

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

About 2,644 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is County RD 12B over Cow Creek?

The structure is 185 ft (56.4 m) long with a longest span of 91 ft (27.7 m) and a deck 50 ft wide.

Who owns County RD 12B over Cow Creek?

It is owned by the County Highway Agency.