US Bridges

27 S 11 W 29.00: over Alder Creek

FairPosted for load

Coos County, Oregon · 8.2 Miles NE of Coos Bay · Structure no. 0000000L1439083

Built
1957
68 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Concrete Continuous
Length
72 ft
3 main spans
Daily traffic
50
2024 count
Owner
Federal
Bureau of Land Management

About this bridge

27 S 11 W 29.00: over Alder Creek is a concrete continuous stringer/multi-beam or girder carrying 27 S 11 W 29.00: over Alder Creek in Coos County, Oregon. It was built in 1957, so it is 68 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 6 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 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2044. The structure is 72 ft (21.9 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Carries27 S 11 W 29.00:
CrossesAlder Creek
Location8.2 Miles NE of Coos Bay
RouteFederal Lands Road 0
StateOregon
Coordinates43.24972, -123.93673
Functional classRural Minor 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment6: Equal to present minimum criteria
Operating rating26.8 US tons
Inventory rating20.7 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length72 ft (21.9 m)
Longest span50 ft (15.2 m)
Deck width16 ft (5 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2024)
Projected traffic75 by 2044
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Land Management
Maintained byBureau of Land Management
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost$3,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 27 S 11 W 29.00: over Alder Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is 27 S 11 W 29.00: over Alder 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 27 S 11 W 29.00: over Alder Creek carry?

About 50 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is 27 S 11 W 29.00: over Alder Creek?

The structure is 72 ft (21.9 m) long with a longest span of 50 ft (15.2 m) and a deck 16 ft wide.

Who owns 27 S 11 W 29.00: over Alder Creek?

It is owned by the Bureau of Land Management.