US Bridges

20 S 11 W 36.00: over Smith River

Fair

Douglas County, Oregon · 47.1 Miles NE of HWY 101 · Structure no. 0000000L1439050

Built
1959
66 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Concrete Continuous
Length
186 ft
3 main spans
Daily traffic
50
2023 count
Owner
Federal
Bureau of Land Management

About this bridge

20 S 11 W 36.00: over Smith River is a concrete continuous tee beam carrying 20 S 11 W 36.00: over Smith River in Douglas County, Oregon. It was built in 1959, so it is 66 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.

It carries about 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2043. The structure is 186 ft (56.7 m) long and 16 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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Carries20 S 11 W 36.00:
CrossesSmith River
Location47.1 Miles NE of HWY 101
RouteFederal Lands Road 0
CountyDouglas County
StateOregon
Coordinates43.79306, -123.64944
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating94.2 US tons
Inventory rating56.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length186 ft (56.7 m)
Longest span72 ft (21.9 m)
Deck width16 ft (5 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2043
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$5,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 20 S 11 W 36.00: over Smith River built?

It was built in 1959, making it 66 years old in 2025.

What condition is 20 S 11 W 36.00: over Smith River 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 Smith River carry?

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

How long is 20 S 11 W 36.00: over Smith River?

The structure is 186 ft (56.7 m) long with a longest span of 72 ft (21.9 m) and a deck 16 ft wide.

Who owns 20 S 11 W 36.00: over Smith River?

It is owned by the Bureau of Land Management.