US Bridges

Liberty Island RD over Shag Slough

Fair

Solano County, California · 12.6 MI N RTE 12 · Structure no. 23C0119

Built
1992
33 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete Continuous
Length
373 ft
11 main spans
Daily traffic
20
2010 count
Owner
County
County Highway Agency

About this bridge

Liberty Island RD over Shag Slough is a concrete continuous slab carrying Liberty Island RD over Shag Slough in Solano County, California. It was built in 1992, so it is 33 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. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 20 vehicles a day, projected to reach 51 by 2041. The structure is 373 ft (113.8 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesLiberty Island RD
CrossesShag Slough
Location12.6 MI N RTE 12
RouteCounty Highway 0
CountySolano County
StateCalifornia
Coordinates38.30652, -121.69352
Functional classRural Minor 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
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 protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans11
Design loadHS 20 + Mod
Structure length373 ft (113.8 m)
Longest span38 ft (11.6 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2010)
Projected traffic51 by 2041
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Liberty Island RD over Shag Slough built?

It was built in 1992, making it 33 years old in 2025.

What condition is Liberty Island RD over Shag 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 March 2023.

How much traffic does Liberty Island RD over Shag Slough carry?

About 20 vehicles per day (2010 count).

How long is Liberty Island RD over Shag Slough?

The structure is 373 ft (113.8 m) long with a longest span of 38 ft (11.6 m) and a deck 28 ft wide.

Who owns Liberty Island RD over Shag Slough?

It is owned by the County Highway Agency.