US Bridges

Round House RD over Spanish Creek

Fair

Plumas County, California · At SH 70 · Structure no. 09C0097

Built
1940
85 years old, rebuilt 1996
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
132 ft
2 main spans
Daily traffic
60
2019 count
Owner
County
County Highway Agency

About this bridge

Round House RD over Spanish Creek is a prestressed concrete stringer/multi-beam or girder carrying Round House RD over Spanish Creek in Plumas County, California. It was built in 1940 and reconstructed in 1996, 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.

It carries about 60 vehicles a day, projected to reach 81 by 2044. The structure is 132 ft (40.2 m) long and 21 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesRound House RD
CrossesSpanish Creek
LocationAt SH 70
RouteCounty Highway 0
CountyPlumas County
StateCalifornia
Coordinates40.00712, -120.96072
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating28.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length132 ft (40.2 m)
Longest span66 ft (20.1 m)
Deck width21 ft (6.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (2019)
Projected traffic81 by 2044
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Round House RD over Spanish Creek built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1996.

What condition is Round House RD over Spanish Creek 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 October 2023.

How much traffic does Round House RD over Spanish Creek carry?

About 60 vehicles per day (2019 count).

How long is Round House RD over Spanish Creek?

The structure is 132 ft (40.2 m) long with a longest span of 66 ft (20.1 m) and a deck 21 ft wide.

Who owns Round House RD over Spanish Creek?

It is owned by the County Highway Agency.