US Bridges

Muir RD over Channel Slough

Fair

Butte County, California · 0.77 MI N/O Sacramento Av · Structure no. 12C0314

Built
1936
89 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Concrete Continuous
Length
44 ft
2 main spans
Daily traffic
225
2020 count
Owner
County
County Highway Agency

About this bridge

Muir RD over Channel Slough is a concrete continuous tee beam carrying Muir RD over Channel Slough in Butte County, California. It was built in 1936, so it is 89 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 5 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 225 vehicles a day, roughly 8% of them trucks, projected to reach 365 by 2042. The structure is 44 ft (13.3 m) long and 23 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMuir RD
CrossesChannel Slough
Location0.77 MI N/O Sacramento Av
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.74117, -121.90325
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59 US tons
Inventory rating35.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length44 ft (13.3 m)
Longest span21 ft (6.5 m)
Deck width23 ft (7.1 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2020)
Projected traffic365 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Muir RD over Channel Slough built?

It was built in 1936, making it 89 years old in 2025.

What condition is Muir RD over Channel 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 July 2024.

How much traffic does Muir RD over Channel Slough carry?

About 225 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is Muir RD over Channel Slough?

The structure is 44 ft (13.3 m) long with a longest span of 21 ft (6.5 m) and a deck 23 ft wide.

Who owns Muir RD over Channel Slough?

It is owned by the County Highway Agency.