US Bridges

Stwrt Pt-Skgg Sprg over Shingle Mill CR (ohlson)

Fair

Sonoma County, California · 14.3 MI SR 1 Via Anpls RD · Structure no. 20C0142

Built
1935
90 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete
Length
22 ft
1 main span
Daily traffic
300
2015 count
Owner
County
County Highway Agency

About this bridge

Stwrt Pt-Skgg Sprg over Shingle Mill CR (ohlson) is a concrete slab carrying Stwrt Pt-Skgg Sprg over Shingle Mill CR (ohlson) in Sonoma County, California. It was built in 1935, so it is 90 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 300 vehicles a day, roughly 4% of them trucks, projected to reach 367 by 2040. The structure is 22 ft (6.7 m) long and 21 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesStwrt Pt-Skgg Sprg
CrossesShingle Mill CR (ohlson)
Location14.3 MI SR 1 Via Anpls RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.66716, -123.30519
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
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 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 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 rating31.1 US tons
Inventory rating18.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span21 ft (6.5 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2015)
Projected traffic367 by 2040
Trucks4%
Lanes on structure2
Traffic directionTwo-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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Stwrt Pt-Skgg Sprg over Shingle Mill CR (ohlson) built?

It was built in 1935, making it 90 years old in 2025.

What condition is Stwrt Pt-Skgg Sprg over Shingle Mill CR (ohlson) 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 July 2023.

How much traffic does Stwrt Pt-Skgg Sprg over Shingle Mill CR (ohlson) carry?

About 300 vehicles per day (2015 count), of which roughly 4% are trucks.

How long is Stwrt Pt-Skgg Sprg over Shingle Mill CR (ohlson)?

The structure is 22 ft (6.7 m) long with a longest span of 21 ft (6.5 m) and a deck 21 ft wide.

Who owns Stwrt Pt-Skgg Sprg over Shingle Mill CR (ohlson)?

It is owned by the County Highway Agency.