US Bridges

Midway RD over Middle Fork Hamlin Slu

Fair

Butte County, California · 3 MI N of Nelson RD · Structure no. 12C0049

Built
1915
110 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete Continuous
Length
28 ft
3 main spans
Daily traffic
1,254
2018 count
Owner
County
County Highway Agency

About this bridge

Midway RD over Middle Fork Hamlin Slu is a concrete continuous culvert carrying Midway RD over Middle Fork Hamlin Slu in Butte County, California. It was built in 1915, so it is 110 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 1,254 vehicles a day, roughly 14% of them trucks, projected to reach 2,130 by 2042. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesMidway RD
CrossesMiddle Fork Hamlin Slu
Location3 MI N of Nelson RD
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.59337, -121.78004
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 protection8 Very GoodNo problems noted.
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 evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span9 ft (2.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,254 (2018)
Projected traffic2,130 by 2042
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Middle Fork Hamlin Slu built?

It was built in 1915, making it 110 years old in 2025.

What condition is Midway RD over Middle Fork Hamlin Slu 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 Middle Fork Hamlin Slu carry?

About 1,254 vehicles per day (2018 count), of which roughly 14% are trucks.

How long is Midway RD over Middle Fork Hamlin Slu?

The structure is 28 ft (8.5 m) long with a longest span of 9 ft (2.7 m).

Who owns Midway RD over Middle Fork Hamlin Slu?

It is owned by the County Highway Agency.