US Bridges

Township Road over Gilsizer Slough

Fair

Sutter County, California · 0.6 MI S of Obanion RD · Structure no. 18C0126

Built
1923
102 years old
Condition
Fair
inspected February 2024
Type
Girder and Floorbeam System
Concrete
Length
41 ft
1 main span
Daily traffic
200
2015 count
Owner
County
County Highway Agency

About this bridge

Township Road over Gilsizer Slough is a concrete girder and floorbeam system carrying Township Road over Gilsizer Slough in Sutter County, California. It was built in 1923, so it is 102 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 200 vehicles a day, roughly 5% of them trucks, projected to reach 164 by 2042. The structure is 41 ft (12.5 m) long and 26 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesTownship Road
CrossesGilsizer Slough
Location0.6 MI S of Obanion RD
RouteCounty Highway 0
CountySutter County
StateCalifornia
Coordinates39.01592, -121.68976
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: 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 rating27.4 US tons
Inventory rating16.4 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length41 ft (12.5 m)
Longest span40 ft (12.3 m)
Deck width26 ft (7.8 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2015)
Projected traffic164 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Township Road over Gilsizer Slough built?

It was built in 1923, making it 102 years old in 2025.

What condition is Township Road over Gilsizer 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 February 2024.

How much traffic does Township Road over Gilsizer Slough carry?

About 200 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Township Road over Gilsizer Slough?

The structure is 41 ft (12.5 m) long with a longest span of 40 ft (12.3 m) and a deck 26 ft wide.

Who owns Township Road over Gilsizer Slough?

It is owned by the County Highway Agency.