US Bridges

Anapolis RD over South Fork Gualala River

Fair

Sonoma County, California · 1.5 MI E/O SR 1 · Structure no. 20C0014

Built
1974
51 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
461 ft
3 main spans
Daily traffic
400
2015 count
Owner
County
County Highway Agency

About this bridge

Anapolis RD over South Fork Gualala River is a concrete continuous box beam or girders - multiple carrying Anapolis RD over South Fork Gualala River in Sonoma County, California. It was built in 1974, so it is 51 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 400 vehicles a day, roughly 4% of them trucks, projected to reach 335 by 2040. The structure is 461 ft (140.5 m) long and 32 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesAnapolis RD
CrossesSouth Fork Gualala River
Location1.5 MI E/O SR 1
RouteCounty Highway 0
Coordinates38.70014, -123.41576
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 protection7 GoodSome minor problems.
Last inspectionJune 2023
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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110 US tons
Inventory rating110 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length461 ft (140.5 m)
Longest span170 ft (51.8 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2015)
Projected traffic335 by 2040
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 Anapolis RD over South Fork Gualala River built?

It was built in 1974, making it 51 years old in 2025.

What condition is Anapolis RD over South Fork Gualala River 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 June 2023.

How much traffic does Anapolis RD over South Fork Gualala River carry?

About 400 vehicles per day (2015 count), of which roughly 4% are trucks.

How long is Anapolis RD over South Fork Gualala River?

The structure is 461 ft (140.5 m) long with a longest span of 170 ft (51.8 m) and a deck 32 ft wide.

Who owns Anapolis RD over South Fork Gualala River?

It is owned by the County Highway Agency.