US Bridges

County RD 388 over Cooper Creek

FairPosted for load

Douglas County, Oregon · 0.7 MI S of Sutherlin · Structure no. 19C452 388 490

Built
1921
104 years old
Condition
Fair
inspected April 2024
Type
Tee Beam
Concrete
Length
50 ft
1 main span
Daily traffic
6,857
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 388 over Cooper Creek is a concrete tee beam carrying County RD 388 over Cooper Creek in Douglas County, Oregon. It was built in 1921, so it is 104 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 6,857 vehicles a day, roughly 10% of them trucks, projected to reach 7,607 by 2025. The structure is 50 ft (15.2 m) long and 43 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCounty RD 388
CrossesCooper Creek
Location0.7 MI S of Sutherlin
RouteCounty Highway 0A411
CountyDouglas County
StateOregon
Coordinates43.38008, -123.3179
Functional classUrban Minor Arterial

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 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
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating14.7 US tons
Inventory rating11.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length50 ft (15.2 m)
Longest span49 ft (14.9 m)
Deck width43 ft (13.1 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,857 (2020)
Projected traffic7,607 by 2025
Trucks10%
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 County RD 388 over Cooper Creek built?

It was built in 1921, making it 104 years old in 2025.

What condition is County RD 388 over Cooper 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 April 2024.

How much traffic does County RD 388 over Cooper Creek carry?

About 6,857 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is County RD 388 over Cooper Creek?

The structure is 50 ft (15.2 m) long with a longest span of 49 ft (14.9 m) and a deck 43 ft wide.

Who owns County RD 388 over Cooper Creek?

It is owned by the County Highway Agency.