US Bridges

Sycamore Cutoff over Irrigation Ditch

Good

Colusa County, California · 0.1 MI N/E of SR 45 · Structure no. 15C0115

Built
1930
95 years old
Condition
Good
inspected October 2023
Type
Tee Beam
Concrete
Length
22 ft
1 main span
Daily traffic
1,085
2014 count
Owner
County
County Highway Agency

About this bridge

Sycamore Cutoff over Irrigation Ditch is a concrete tee beam carrying Sycamore Cutoff over Irrigation Ditch in Colusa County, California. It was built in 1930, so it is 95 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,085 vehicles a day, roughly 10% of them trucks, projected to reach 1,175 by 2042. The structure is 22 ft (6.7 m) long and 23 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSycamore Cutoff
CrossesIrrigation Ditch
Location0.1 MI N/E of SR 45
RouteCounty Highway 0
Coordinates39.13786, -121.94757
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating31.1 US tons
Inventory rating18.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span21 ft (6.4 m)
Deck width23 ft (6.9 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,085 (2014)
Projected traffic1,175 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Sycamore Cutoff over Irrigation Ditch built?

It was built in 1930, making it 95 years old in 2025.

What condition is Sycamore Cutoff over Irrigation Ditch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does Sycamore Cutoff over Irrigation Ditch carry?

About 1,085 vehicles per day (2014 count), of which roughly 10% are trucks.

How long is Sycamore Cutoff over Irrigation Ditch?

The structure is 22 ft (6.7 m) long with a longest span of 21 ft (6.4 m) and a deck 23 ft wide.

Who owns Sycamore Cutoff over Irrigation Ditch?

It is owned by the County Highway Agency.