US Bridges

State Route 128 over Sausal Creek

Fair

Sonoma County, California · 04-SON-128-12.19 · Structure no. 20 0040

Built
1984
41 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
107 ft
3 main spans
Daily traffic
2,750
2016 count
Owner
State
State Highway Agency

About this bridge

State Route 128 over Sausal Creek is a concrete continuous slab carrying State Route 128 over Sausal Creek in Sonoma County, California. It was built in 1984, so it is 41 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 6 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 2,750 vehicles a day, roughly 6% of them trucks, projected to reach 3,275 by 2046. The structure is 107 ft (32.6 m) long and 35 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesState Route 128
CrossesSausal Creek
Location04-SON-128-12.19
RouteState Highway 128
CountySonoma County
StateCalifornia
Coordinates38.66953, -122.81039
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length107 ft (32.6 m)
Longest span35 ft (10.7 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,750 (2016)
Projected traffic3,275 by 2046
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 128 over Sausal Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is State Route 128 over Sausal 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 November 2024.

How much traffic does State Route 128 over Sausal Creek carry?

About 2,750 vehicles per day (2016 count), of which roughly 6% are trucks.

How long is State Route 128 over Sausal Creek?

The structure is 107 ft (32.6 m) long with a longest span of 35 ft (10.7 m) and a deck 35 ft wide.

Who owns State Route 128 over Sausal Creek?

It is owned by the State Highway Agency.