US Bridges

20 S 11 W 36.00: over Spencer Creek

Fair

Douglas County, Oregon · 20.5 Miles NE of HWY 101 · Structure no. 0000000L1439046

Built
1953
72 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Concrete Continuous
Length
160 ft
5 main spans
Daily traffic
50
2023 count
Owner
Federal
Bureau of Land Management

About this bridge

20 S 11 W 36.00: over Spencer Creek is a concrete continuous tee beam carrying 20 S 11 W 36.00: over Spencer Creek in Douglas County, Oregon. It was built in 1953, so it is 72 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.

It carries about 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2043. The structure is 160 ft (48.8 m) long and 31 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
Carries20 S 11 W 36.00:
CrossesSpencer Creek
Location20.5 Miles NE of HWY 101
RouteFederal Lands Road 0
CountyDouglas County
StateOregon
Coordinates43.79639, -123.8825
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.
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 inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.9 US tons
Inventory rating44.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadOther
Structure length160 ft (48.8 m)
Longest span60 ft (18.3 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$35,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 20 S 11 W 36.00: over Spencer Creek built?

It was built in 1953, making it 72 years old in 2025.

What condition is 20 S 11 W 36.00: over Spencer 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 March 2023.

How much traffic does 20 S 11 W 36.00: over Spencer Creek carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is 20 S 11 W 36.00: over Spencer Creek?

The structure is 160 ft (48.8 m) long with a longest span of 60 ft (18.3 m) and a deck 31 ft wide.

Who owns 20 S 11 W 36.00: over Spencer Creek?

It is owned by the Bureau of Land Management.