US Bridges

Road over Siltcoos Lake Outlet

Good

Lane County, Oregon · No Data Entered · Structure no. 061204000001100

Built
1971
54 years old
Condition
Good
inspected June 2021
Type
Frame
Concrete Continuous
Length
111 ft
3 main spans
Daily traffic
40
1996 count
Owner
Federal
U.S. Forest Service

About this bridge

Road over Siltcoos Lake Outlet is a concrete continuous frame carrying Road over Siltcoos Lake Outlet in Lane County, Oregon. It was built in 1971, so it is 54 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 40 vehicles a day, projected to reach 60 by 2045. The structure is 111 ft (33.8 m) long and 35 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

Location

Open in Google Maps
CarriesRoad
CrossesSiltcoos Lake Outlet
LocationNo Data Entered
RouteFederal Lands Road 10700
CountyLane County
StateOregon
Coordinates43.87715, -124.13825
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating38 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length111 ft (33.8 m)
Longest span75 ft (22.9 m)
Deck width35 ft (10.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (1996)
Projected traffic60 by 2045
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed620.7 mi (999 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Road over Siltcoos Lake Outlet built?

It was built in 1971, making it 54 years old in 2025.

What condition is Road over Siltcoos Lake Outlet in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2021.

How much traffic does Road over Siltcoos Lake Outlet carry?

About 40 vehicles per day (1996 count).

How long is Road over Siltcoos Lake Outlet?

The structure is 111 ft (33.8 m) long with a longest span of 75 ft (22.9 m) and a deck 35 ft wide.

Who owns Road over Siltcoos Lake Outlet?

It is owned by the U.S. Forest Service.