US Bridges

State Route 99 NB over Little Chico Creek

Fair

Butte County, California · 03-BUT-099-R32.20-CHC · Structure no. 12 0148R

Built
1965
60 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Concrete
Length
80 ft
1 main span
Daily traffic
24,750
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 99 NB over Little Chico Creek is a concrete box beam or girders - multiple carrying State Route 99 NB over Little Chico Creek in Butte County, California. It was built in 1965, so it is 60 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 24,750 vehicles a day, roughly 7% of them trucks, projected to reach 46,308 by 2041. The structure is 80 ft (24.4 m) long and 41 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesState Route 99 NB
CrossesLittle Chico Creek
Location03-BUT-099-R32.20-CHC
RouteState Highway 99
CountyButte County
StateCalifornia
Coordinates39.7344, -121.81646
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionMay 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 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 rating56.8 US tons
Inventory rating43.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span79 ft (24.1 m)
Deck width41 ft (12.5 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,750 (2009)
Projected traffic46,308 by 2041
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 NB over Little Chico Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is State Route 99 NB over Little Chico 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 2023.

How much traffic does State Route 99 NB over Little Chico Creek carry?

About 24,750 vehicles per day (2009 count), of which roughly 7% are trucks.

How long is State Route 99 NB over Little Chico Creek?

The structure is 80 ft (24.4 m) long with a longest span of 79 ft (24.1 m) and a deck 41 ft wide.

Who owns State Route 99 NB over Little Chico Creek?

It is owned by the State Highway Agency.