US Bridges

Pine Flat RD over Sausal Creek

Poor

Sonoma County, California · 0.63 MI NE of SR 128 · Structure no. 20C0413

Built
1974
51 years old
Condition
Poor
inspected July 2023
Type
Slab
Concrete Continuous
Length
103 ft
3 main spans
Daily traffic
100
2011 count
Owner
County
County Highway Agency

About this bridge

Pine Flat RD over Sausal Creek is a concrete continuous slab carrying Pine Flat RD over Sausal 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 100 vehicles a day, roughly 1% of them trucks, projected to reach 161 by 2041. The structure is 103 ft (31.4 m) long and 33 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesPine Flat RD
CrossesSausal Creek
Location0.63 MI NE of SR 128
RouteCounty Highway 0
Coordinates38.67785, -122.80532
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 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 geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating98.9 US tons
Inventory rating59.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length103 ft (31.4 m)
Longest span40 ft (12.2 m)
Deck width33 ft (10 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2011)
Projected traffic161 by 2041
Trucks1%
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$527,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Pine Flat RD over Sausal Creek built?

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

What condition is Pine Flat RD over Sausal Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2023.

How much traffic does Pine Flat RD over Sausal Creek carry?

About 100 vehicles per day (2011 count), of which roughly 1% are trucks.

How long is Pine Flat RD over Sausal Creek?

The structure is 103 ft (31.4 m) long with a longest span of 40 ft (12.2 m) and a deck 33 ft wide.

Who owns Pine Flat RD over Sausal Creek?

It is owned by the County Highway Agency.