US Bridges

Butt Reservoir RD over Butt Reservoir Spillway

FairPosted for load

Plumas County, California · 9.3 MI South of SR 89 · Structure no. 09C0061

Built
1940
85 years old
Condition
Fair
inspected September 2023
Type
Truss - Thru
Steel
Length
57 ft
1 main span
Daily traffic
80
2019 count
Owner
County
County Highway Agency

About this bridge

Butt Reservoir RD over Butt Reservoir Spillway is a steel truss - thru carrying Butt Reservoir RD over Butt Reservoir Spillway in Plumas County, California. It was built in 1940, so it is 85 years old, older than the California average of 54.8 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. Its operating status is: posted for other load-capacity restriction.

It carries about 80 vehicles a day, roughly 2% of them trucks, projected to reach 90 by 2041. The structure is 57 ft (17.4 m) long and 17 ft wide. If it were closed, the detour would be 42.9 mi (69 km).

Location

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CarriesButt Reservoir RD
CrossesButt Reservoir Spillway
Location9.3 MI South of SR 89
RouteCounty Highway 0
CountyPlumas County
StateCalifornia
Coordinates40.11428, -121.14392
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30.8 US tons
Inventory rating18.2 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length57 ft (17.4 m)
Longest span55 ft (16.8 m)
Deck width17 ft (5.1 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2019)
Projected traffic90 by 2041
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.9 mi (69 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Butt Reservoir RD over Butt Reservoir Spillway built?

It was built in 1940, making it 85 years old in 2025.

What condition is Butt Reservoir RD over Butt Reservoir Spillway 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 September 2023.

How much traffic does Butt Reservoir RD over Butt Reservoir Spillway carry?

About 80 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is Butt Reservoir RD over Butt Reservoir Spillway?

The structure is 57 ft (17.4 m) long with a longest span of 55 ft (16.8 m) and a deck 17 ft wide.

Who owns Butt Reservoir RD over Butt Reservoir Spillway?

It is owned by the County Highway Agency.