US Bridges

Road 99W over Truckee Creek

Fair

Tehama County, California · 0.1 MI North of Hamilton · Structure no. 08C0112

Built
1917
108 years old, rebuilt 1936
Condition
Fair
inspected February 2024
Type
Tee Beam
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
2,000
2006 count
Owner
County
County Highway Agency

About this bridge

Road 99W over Truckee Creek is a concrete continuous tee beam carrying Road 99W over Truckee Creek in Tehama County, California. It was built in 1917 and reconstructed in 1936, so it is 108 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 2,000 vehicles a day, roughly 2% of them trucks, projected to reach 3,074 by 2046. The structure is 22 ft (6.7 m) long and 43 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesRoad 99W
CrossesTruckee Creek
Location0.1 MI North of Hamilton
RouteCounty Highway 0
CountyTehama County
StateCalifornia
Coordinates40.01675, -122.17173
Functional classRural Minor Arterial

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.
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 inspectionFebruary 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating24.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span20 ft (6.1 m)
Deck width43 ft (13.1 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2006)
Projected traffic3,074 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Road 99W over Truckee Creek built?

It was built in 1917, making it 108 years old in 2025. It was reconstructed in 1936.

What condition is Road 99W over Truckee 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 February 2024.

How much traffic does Road 99W over Truckee Creek carry?

About 2,000 vehicles per day (2006 count), of which roughly 2% are trucks.

How long is Road 99W over Truckee Creek?

The structure is 22 ft (6.7 m) long with a longest span of 20 ft (6.1 m) and a deck 43 ft wide.

Who owns Road 99W over Truckee Creek?

It is owned by the County Highway Agency.