US Bridges

NF 1993 over Cougar Dam

Fair

Lane County, Oregon · Cougar Dam Spillway · Structure no. CEPNPPOR000CD01

Built
1959
66 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
98 ft
2 main spans
Daily traffic
100
2013 count
Owner
Federal
Corps of Engineers (Civil)

About this bridge

NF 1993 over Cougar Dam is a concrete stringer/multi-beam or girder carrying NF 1993 over Cougar Dam in Lane 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 100 by 2042. The structure is 98 ft (29.8 m) long and 30 ft wide. If it were closed, the detour would be 26.1 mi (42 km).

Location

Open in Google Maps
CarriesNF 1993
CrossesCougar Dam
LocationCougar Dam Spillway
CountyLane County
StateOregon
Coordinates44.12931, -122.23755
Functional classRural Local

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 protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating63.2 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadGreater than HL 93
Structure length98 ft (29.8 m)
Longest span45 ft (13.7 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2013)
Projected traffic100 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.1 mi (42 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCorps of Engineers (Civil)
Maintained byCorps of Engineers (Civil)
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$393,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NF 1993 over Cougar Dam built?

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

What condition is NF 1993 over Cougar Dam 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 May 2023.

How much traffic does NF 1993 over Cougar Dam carry?

About 100 vehicles per day (2013 count), of which roughly 10% are trucks.

How long is NF 1993 over Cougar Dam?

The structure is 98 ft (29.8 m) long with a longest span of 45 ft (13.7 m) and a deck 30 ft wide.

Who owns NF 1993 over Cougar Dam?

It is owned by the Corps of Engineers (Civil).