US Bridges

Simpson Road over Thomes Creek

Fair

Tehama County, California · 0.3 MI S Paskenta RD · Structure no. 08C0031

Built
1948
77 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
301 ft
6 main spans
Daily traffic
200
2007 count
Owner
County
County Highway Agency

About this bridge

Simpson Road over Thomes Creek is a steel continuous stringer/multi-beam or girder carrying Simpson Road over Thomes Creek in Tehama County, California. It was built in 1948, so it is 77 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 200 vehicles a day, roughly 10% of them trucks, projected to reach 321 by 2041. The structure is 301 ft (91.7 m) long and 27 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesSimpson Road
CrossesThomes Creek
Location0.3 MI S Paskenta RD
RouteCounty Highway 0
CountyTehama County
StateCalifornia
Coordinates39.956, -122.32945
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating65.4 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length301 ft (91.7 m)
Longest span50 ft (15.2 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2007)
Projected traffic321 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 Simpson Road over Thomes Creek built?

It was built in 1948, making it 77 years old in 2025.

What condition is Simpson Road over Thomes 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 2024.

How much traffic does Simpson Road over Thomes Creek carry?

About 200 vehicles per day (2007 count), of which roughly 10% are trucks.

How long is Simpson Road over Thomes Creek?

The structure is 301 ft (91.7 m) long with a longest span of 50 ft (15.2 m) and a deck 27 ft wide.

Who owns Simpson Road over Thomes Creek?

It is owned by the County Highway Agency.