US Bridges

Lake Davis Road over Lake Davis Spillway

Fair

Plumas County, California · 7.1 MI N/O SH 70 · Structure no. 09C0142

Built
1966
59 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Concrete
Length
41 ft
1 main span
Daily traffic
300
2017 count
Owner
County
County Highway Agency

About this bridge

Lake Davis Road over Lake Davis Spillway is a concrete tee beam carrying Lake Davis Road over Lake Davis Spillway in Plumas County, California. It was built in 1966, so it is 59 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.

It carries about 300 vehicles a day, roughly 6% of them trucks, projected to reach 625 by 2042. The structure is 41 ft (12.5 m) long and 34 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

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CarriesLake Davis Road
CrossesLake Davis Spillway
Location7.1 MI N/O SH 70
RouteCounty Highway 0
CountyPlumas County
StateCalifornia
Coordinates39.88262, -120.47702
Functional classRural Major 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40 US tons
Inventory rating27.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length41 ft (12.5 m)
Longest span38 ft (11.6 m)
Deck width34 ft (10.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2017)
Projected traffic625 by 2042
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed18 mi (29 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Lake Davis Road over Lake Davis Spillway built?

It was built in 1966, making it 59 years old in 2025.

What condition is Lake Davis Road over Lake Davis 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 2024.

How much traffic does Lake Davis Road over Lake Davis Spillway carry?

About 300 vehicles per day (2017 count), of which roughly 6% are trucks.

How long is Lake Davis Road over Lake Davis Spillway?

The structure is 41 ft (12.5 m) long with a longest span of 38 ft (11.6 m) and a deck 34 ft wide.

Who owns Lake Davis Road over Lake Davis Spillway?

It is owned by the County Highway Agency.