US Bridges

Bohemian HWY over Dutch Bill Creek

Fair

Sonoma County, California · 5.4 MI from SR 116 · Structure no. 20C0158

Built
1935
90 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete
Length
26 ft
1 main span
Daily traffic
2,100
2015 count
Owner
County
County Highway Agency

About this bridge

Bohemian HWY over Dutch Bill Creek is a concrete slab carrying Bohemian HWY over Dutch Bill Creek 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 2,100 vehicles a day, roughly 5% of them trucks, projected to reach 3,469 by 2041. The structure is 26 ft (7.9 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesBohemian HWY
CrossesDutch Bill Creek
Location5.4 MI from SR 116
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.42401, -122.9563
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.7 US tons
Inventory rating19 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span24 ft (7.3 m)
Deck width27 ft (8.2 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,100 (2015)
Projected traffic3,469 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Bohemian HWY over Dutch Bill Creek built?

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

What condition is Bohemian HWY over Dutch Bill Creek 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 October 2023.

How much traffic does Bohemian HWY over Dutch Bill Creek carry?

About 2,100 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Bohemian HWY over Dutch Bill Creek?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.3 m) and a deck 27 ft wide.

Who owns Bohemian HWY over Dutch Bill Creek?

It is owned by the County Highway Agency.