US Bridges

Wallace Creek RD over Wallace Creek

Fair

Sonoma County, California · 0.5 MI W Mill Creek RD · Structure no. 20C0350

Built
1974
51 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
52 ft
3 main spans
Daily traffic
130
2015 count
Owner
County
County Highway Agency

About this bridge

Wallace Creek RD over Wallace Creek is a steel stringer/multi-beam or girder carrying Wallace Creek RD over Wallace Creek 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 130 vehicles a day, roughly 1% of them trucks, projected to reach 315 by 2040. The structure is 52 ft (15.8 m) long and 14 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesWallace Creek RD
CrossesWallace Creek
Location0.5 MI W Mill Creek RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.59925, -122.92092
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
Deck7 GoodSome minor problems.
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 inspectionMay 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.2 US tons
Inventory rating37.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans3
Design loadUnknown
Structure length52 ft (15.8 m)
Longest span20 ft (6.1 m)
Deck width14 ft (4.3 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic130 (2015)
Projected traffic315 by 2040
Trucks1%
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Wallace Creek RD over Wallace Creek built?

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

What condition is Wallace Creek RD over Wallace 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 May 2023.

How much traffic does Wallace Creek RD over Wallace Creek carry?

About 130 vehicles per day (2015 count), of which roughly 1% are trucks.

How long is Wallace Creek RD over Wallace Creek?

The structure is 52 ft (15.8 m) long with a longest span of 20 ft (6.1 m) and a deck 14 ft wide.

Who owns Wallace Creek RD over Wallace Creek?

It is owned by the County Highway Agency.