US Bridges

Flannery Road over The Big Ditch

Fair

Solano County, California · 0.7 MI E RTE 113 · Structure no. 23C0256

Built
2003
22 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete Continuous
Length
54 ft
2 main spans
Daily traffic
36
2011 count
Owner
County
County Highway Agency

About this bridge

Flannery Road over The Big Ditch is a concrete continuous slab carrying Flannery Road over The Big Ditch in Solano County, California. It was built in 2003, so it is 22 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 36 vehicles a day, roughly 2% of them trucks, projected to reach 39 by 2041. The structure is 54 ft (16.5 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesFlannery Road
CrossesThe Big Ditch
Location0.7 MI E RTE 113
RouteCounty Highway 0
CountySolano County
StateCalifornia
Coordinates38.21263, -121.79331
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
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 inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum 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 spans2
Design loadHS 20 + Mod
Structure length54 ft (16.5 m)
Longest span24 ft (7.3 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36 (2011)
Projected traffic39 by 2041
Trucks2%
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 Flannery Road over The Big Ditch built?

It was built in 2003, making it 22 years old in 2025.

What condition is Flannery Road over The Big Ditch 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 March 2023.

How much traffic does Flannery Road over The Big Ditch carry?

About 36 vehicles per day (2011 count), of which roughly 2% are trucks.

How long is Flannery Road over The Big Ditch?

The structure is 54 ft (16.5 m) long with a longest span of 24 ft (7.3 m) and a deck 31 ft wide.

Who owns Flannery Road over The Big Ditch?

It is owned by the County Highway Agency.