US Bridges

Dayton -Durham HWY over Hamlin Slough

Fair

Butte County, California · East of Hamlin Road · Structure no. 12C0423

Built
2008
17 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete Continuous
Length
122 ft
4 main spans
Daily traffic
2,470
2002 count
Owner
County
County Highway Agency

About this bridge

Dayton -Durham HWY over Hamlin Slough is a concrete continuous slab carrying Dayton -Durham HWY over Hamlin Slough in Butte County, California. It was built in 2008, so it is 17 years old, younger 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 2,470 vehicles a day, roughly 4% of them trucks, projected to reach 3,249 by 2046. The structure is 122 ft (37.1 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesDayton -Durham HWY
CrossesHamlin Slough
LocationEast of Hamlin Road
RouteCounty Highway 0
CountyButte County
StateCalifornia
Coordinates39.64653, -121.74574
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length122 ft (37.1 m)
Longest span34 ft (10.4 m)
Deck width40 ft (12.3 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,470 (2002)
Projected traffic3,249 by 2046
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Dayton -Durham HWY over Hamlin Slough built?

It was built in 2008, making it 17 years old in 2025.

What condition is Dayton -Durham HWY over Hamlin 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 May 2024.

How much traffic does Dayton -Durham HWY over Hamlin Slough carry?

About 2,470 vehicles per day (2002 count), of which roughly 4% are trucks.

How long is Dayton -Durham HWY over Hamlin Slough?

The structure is 122 ft (37.1 m) long with a longest span of 34 ft (10.4 m) and a deck 40 ft wide.

Who owns Dayton -Durham HWY over Hamlin Slough?

It is owned by the County Highway Agency.