US Bridges

State Route 99 over Palmetto Ave

Fair

Butte County, California · 03-BUT-099-R33.08-CHC · Structure no. 12 0152

Built
1963
62 years old, rebuilt 2014
Condition
Fair
inspected May 2023
Type
Tee Beam
Concrete Continuous
Length
114 ft
3 main spans
Daily traffic
24,750
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 99 over Palmetto Ave is a concrete continuous tee beam carrying State Route 99 over Palmetto Ave in Butte County, California. It was built in 1963 and reconstructed in 2014, so it is 62 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 46,000 by 2041. The structure is 114 ft (34.7 m) long and 147 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesState Route 99
CrossesPalmetto Ave
Location03-BUT-099-R33.08-CHC
RouteState Highway 99
CountyButte County
StateCalifornia
Coordinates39.74334, -121.82849
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating29.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length114 ft (34.7 m)
Longest span52 ft (15.8 m)
Deck width147 ft (44.7 m)
Roadway width142 ft (43.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,750 (2020)
Projected traffic46,000 by 2041
Trucks7%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 99 over Palmetto Ave built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2014.

What condition is State Route 99 over Palmetto Ave 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 over Palmetto Ave carry?

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

How long is State Route 99 over Palmetto Ave?

The structure is 114 ft (34.7 m) long with a longest span of 52 ft (15.8 m) and a deck 147 ft wide.

Who owns State Route 99 over Palmetto Ave?

It is owned by the State Highway Agency.