US Bridges

State Route 99 over Los Molinos Creek

Fair

Tehama County, California · 02-TEH-099-12.59 · Structure no. 08 0078

Built
1900
125 years old, rebuilt 1935
Condition
Fair
inspected May 2024
Type
Culvert
Concrete Continuous
Length
44 ft
5 main spans
Daily traffic
6,800
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 99 over Los Molinos Creek is a concrete continuous culvert carrying State Route 99 over Los Molinos Creek in Tehama County, California. It was built in 1900 and reconstructed in 1935, so it is 125 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 6,800 vehicles a day, roughly 13% of them trucks, projected to reach 8,249 by 2046. The structure is 44 ft (13.4 m) long and 56 ft wide. If it were closed, the detour would be 28 mi (45 km).

Location

Open in Google Maps
CarriesState Route 99
CrossesLos Molinos Creek
Location02-TEH-099-12.59
RouteState Highway 99
CountyTehama County
StateCalifornia
Coordinates40.03179, -122.09982
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadUnknown
Structure length44 ft (13.4 m)
Longest span8 ft (2.4 m)
Deck width56 ft (17 m)
Roadway width52 ft (15.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,800 (2015)
Projected traffic8,249 by 2046
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed28 mi (45 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 99 over Los Molinos Creek built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1935.

What condition is State Route 99 over Los Molinos 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 May 2024.

How much traffic does State Route 99 over Los Molinos Creek carry?

About 6,800 vehicles per day (2015 count), of which roughly 13% are trucks.

How long is State Route 99 over Los Molinos Creek?

The structure is 44 ft (13.4 m) long with a longest span of 8 ft (2.4 m) and a deck 56 ft wide.

Who owns State Route 99 over Los Molinos Creek?

It is owned by the State Highway Agency.