US Bridges

7 Mile Road over Edgar Slough

Fair

Butte County, California · Just S Nelson RD · Structure no. 12C0230

Built
1965
60 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
50 ft
2 main spans
Daily traffic
184
2019 count
Owner
County
County Highway Agency

About this bridge

7 Mile Road over Edgar Slough is a concrete continuous slab carrying 7 Mile Road over Edgar Slough 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 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 184 vehicles a day, roughly 31% of them trucks, projected to reach 282 by 2041. The structure is 50 ft (15.2 m) long and 33 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
Carries7 Mile Road
CrossesEdgar Slough
LocationJust S Nelson RD
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.54431, -121.90842
Functional classRural Major Collector

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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.5 US tons
Inventory rating34.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length50 ft (15.2 m)
Longest span24 ft (7.3 m)
Deck width33 ft (10 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic184 (2019)
Projected traffic282 by 2041
Trucks31%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 7 Mile Road over Edgar Slough built?

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

What condition is 7 Mile Road over Edgar Slough 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 November 2024.

How much traffic does 7 Mile Road over Edgar Slough carry?

About 184 vehicles per day (2019 count), of which roughly 31% are trucks.

How long is 7 Mile Road over Edgar Slough?

The structure is 50 ft (15.2 m) long with a longest span of 24 ft (7.3 m) and a deck 33 ft wide.

Who owns 7 Mile Road over Edgar Slough?

It is owned by the County Highway Agency.