US Bridges

State Route 128 over Gird Creek

Fair

Sonoma County, California · 04-SON-128-9.75 · Structure no. 20 0130

Built
1983
42 years old
Condition
Fair
inspected October 2022
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
2,750
2014 count
Owner
State
State Highway Agency

About this bridge

State Route 128 over Gird Creek is a concrete continuous culvert carrying State Route 128 over Gird Creek in Sonoma County, California. It was built in 1983, so it is 42 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 3,243 by 2039. The structure is 26 ft (7.9 m) long and 35 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesState Route 128
CrossesGird Creek
Location04-SON-128-9.75
RouteState Highway 128
CountySonoma County
StateCalifornia
Coordinates38.68434, -122.84267
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,750 (2014)
Projected traffic3,243 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 Gird Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is State Route 128 over Gird 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 2022.

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

About 2,750 vehicles per day (2014 count), of which roughly 6% are trucks.

How long is State Route 128 over Gird Creek?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m) and a deck 35 ft wide.

Who owns State Route 128 over Gird Creek?

It is owned by the State Highway Agency.