US Bridges

State Route 99 NB over Bike Path

Fair

Butte County, California · 03-BUT-099-R34.63-CHC · Structure no. 12 0157R

Built
1966
59 years old
Condition
Fair
inspected April 2024
Type
Tee Beam
Concrete Continuous
Length
112 ft
3 main spans
Daily traffic
24,750
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 99 NB over Bike Path is a concrete continuous tee beam carrying State Route 99 NB over Bike Path in Butte County, California. It was built in 1966, so it is 59 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 6 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 47,085 by 2046. The structure is 112 ft (34.1 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesState Route 99 NB
CrossesBike Path
Location03-BUT-099-R34.63-CHC
RouteState Highway 99
Coordinates39.75768, -121.85091
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.7 US tons
Inventory rating31.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length112 ft (34.1 m)
Longest span43 ft (13.1 m)
Deck width40 ft (12.1 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,750 (2020)
Projected traffic47,085 by 2046
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesPedestrian / bicycle
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 99 NB over Bike Path built?

It was built in 1966, making it 59 years old in 2025.

What condition is State Route 99 NB over Bike Path 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 April 2024.

How much traffic does State Route 99 NB over Bike Path carry?

About 24,750 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is State Route 99 NB over Bike Path?

The structure is 112 ft (34.1 m) long with a longest span of 43 ft (13.1 m) and a deck 40 ft wide.

Who owns State Route 99 NB over Bike Path?

It is owned by the State Highway Agency.