US Bridges

Grand Ave over State Route 70

Fair

Butte County, California · 03-BUT-070-15.43-OVL · Structure no. 12 0107

Built
1963
62 years old
Condition
Fair
inspected May 2024
Type
Tee Beam
Concrete Continuous
Length
185 ft
4 main spans
Daily traffic
5,761
2020 count
Owner
State
State Highway Agency

About this bridge

Grand Ave over State Route 70 is a concrete continuous tee beam carrying Grand Ave over State Route 70 in Butte County, California. It was built in 1963, 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 5,761 vehicles a day, roughly 12% of them trucks, projected to reach 11,013 by 2041. The structure is 185 ft (56.4 m) long and 40 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesGrand Ave
CrossesState Route 70
Location03-BUT-070-15.43-OVL
RouteCity Street 0
CountyButte County
StateCalifornia
Coordinates39.51953, -121.57295
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 inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.3 US tons
Inventory rating38.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length185 ft (56.4 m)
Longest span48 ft (14.6 m)
Deck width40 ft (12.3 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,761 (2020)
Projected traffic11,013 by 2041
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed6.2 mi (10 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 Grand Ave over State Route 70 built?

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

What condition is Grand Ave over State Route 70 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 Grand Ave over State Route 70 carry?

About 5,761 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is Grand Ave over State Route 70?

The structure is 185 ft (56.4 m) long with a longest span of 48 ft (14.6 m) and a deck 40 ft wide.

Who owns Grand Ave over State Route 70?

It is owned by the State Highway Agency.