US Bridges

Eaton Ave over State Route 99

Fair

Butte County, California · 03-BUT-099-R36.31 · Structure no. 12 0160

Built
1966
59 years old
Condition
Fair
inspected April 2024
Type
Tee Beam
Concrete Continuous
Length
176 ft
4 main spans
Daily traffic
5,400
2020 count
Owner
State
State Highway Agency

About this bridge

Eaton Ave over State Route 99 is a concrete continuous tee beam carrying Eaton Ave over State Route 99 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 5,400 vehicles a day, roughly 10% of them trucks, projected to reach 9,243 by 2043. The structure is 176 ft (53.6 m) long and 40 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesEaton Ave
CrossesState Route 99
Location03-BUT-099-R36.31
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.77437, -121.87353
Functional classUrban 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
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.2 US tons
Inventory rating25.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length176 ft (53.6 m)
Longest span59 ft (17.9 m)
Deck width40 ft (12.3 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,400 (2020)
Projected traffic9,243 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

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 Eaton Ave over State Route 99 built?

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

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

About 5,400 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Eaton Ave over State Route 99?

The structure is 176 ft (53.6 m) long with a longest span of 59 ft (17.9 m) and a deck 40 ft wide.

Who owns Eaton Ave over State Route 99?

It is owned by the State Highway Agency.