US Bridges

Soda Springs RD over Onion Creek

Fair

Placer County, California · 6.6 MI S Soda Springs · Structure no. 19C0178

Built
1975
50 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
41 ft
1 main span
Daily traffic
187
1996 count
Owner
County
County Highway Agency

About this bridge

Soda Springs RD over Onion Creek is a steel stringer/multi-beam or girder carrying Soda Springs RD over Onion Creek in Placer County, California. It was built in 1975, so it is 50 years old, younger 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 187 vehicles a day, roughly 10% of them trucks, projected to reach 109 by 2041. The structure is 41 ft (12.5 m) long and 15 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSoda Springs RD
CrossesOnion Creek
Location6.6 MI S Soda Springs
RouteCounty Highway 0
CountyPlacer County
StateCalifornia
Coordinates39.27525, -120.36099
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.
Superstructure7 GoodSome minor problems.
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 inspectionJuly 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39.7 US tons
Inventory rating30.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length41 ft (12.5 m)
Longest span37 ft (11.3 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic187 (1996)
Projected traffic109 by 2041
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 Soda Springs RD over Onion Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is Soda Springs RD over Onion 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 July 2023.

How much traffic does Soda Springs RD over Onion Creek carry?

About 187 vehicles per day (1996 count), of which roughly 10% are trucks.

How long is Soda Springs RD over Onion Creek?

The structure is 41 ft (12.5 m) long with a longest span of 37 ft (11.3 m) and a deck 15 ft wide.

Who owns Soda Springs RD over Onion Creek?

It is owned by the County Highway Agency.