US Bridges

Big Springs RD/A13 over Hamilton Branch Creek

Fair

Plumas County, California · 0.1 MI West of SR 147 · Structure no. 09C0035

Built
1955
70 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
371 ft
5 main spans
Daily traffic
1,300
2019 count
Owner
County
County Highway Agency

About this bridge

Big Springs RD/A13 over Hamilton Branch Creek is a steel continuous stringer/multi-beam or girder carrying Big Springs RD/A13 over Hamilton Branch Creek in Plumas County, California. It was built in 1955, so it is 70 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 1,300 vehicles a day, roughly 6% of them trucks, projected to reach 1,800 by 2044. The structure is 371 ft (113.1 m) long and 38 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

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CarriesBig Springs RD/A13
CrossesHamilton Branch Creek
Location0.1 MI West of SR 147
RouteCounty Highway 0
CountyPlumas County
StateCalifornia
Coordinates40.27147, -121.08915
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.9 US tons
Inventory rating18.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5 (+2 approach)
Design loadH 20
Structure length371 ft (113.1 m)
Longest span91 ft (27.7 m)
Deck width38 ft (11.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,300 (2019)
Projected traffic1,800 by 2044
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 Big Springs RD/A13 over Hamilton Branch Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is Big Springs RD/A13 over Hamilton Branch 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 September 2023.

How much traffic does Big Springs RD/A13 over Hamilton Branch Creek carry?

About 1,300 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is Big Springs RD/A13 over Hamilton Branch Creek?

The structure is 371 ft (113.1 m) long with a longest span of 91 ft (27.7 m) and a deck 38 ft wide.

Who owns Big Springs RD/A13 over Hamilton Branch Creek?

It is owned by the County Highway Agency.