US Bridges

Midway RD over Moulton Slough

Fair

Butte County, California · 3 MI N Richvale RD · Structure no. 12C0039

Built
1918
107 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete Continuous
Length
33 ft
3 main spans
Daily traffic
6,630
2018 count
Owner
County
County Highway Agency

About this bridge

Midway RD over Moulton Slough is a concrete continuous culvert carrying Midway RD over Moulton Slough in Butte County, California. It was built in 1918, so it is 107 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 6,630 vehicles a day, roughly 2% of them trucks, projected to reach 9,314 by 2042. The structure is 33 ft (10.1 m) long and 25 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesMidway RD
CrossesMoulton Slough
Location3 MI N Richvale RD
RouteCounty Highway 0
Coordinates39.53083, -121.75681
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span10 ft (3 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,630 (2018)
Projected traffic9,314 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Midway RD over Moulton Slough built?

It was built in 1918, making it 107 years old in 2025.

What condition is Midway RD over Moulton 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 Midway RD over Moulton Slough carry?

About 6,630 vehicles per day (2018 count), of which roughly 2% are trucks.

How long is Midway RD over Moulton Slough?

The structure is 33 ft (10.1 m) long with a longest span of 10 ft (3 m) and a deck 25 ft wide.

Who owns Midway RD over Moulton Slough?

It is owned by the County Highway Agency.