US Bridges

State Route 128 over Shearing Creek

Good

Mendocino County, California · 01-MEN-128-34.49 · Structure no. 10 0059

Built
1939
86 years old, rebuilt 1991
Condition
Good
inspected May 2023
Type
Slab
Concrete Continuous
Length
54 ft
4 main spans
Daily traffic
2,050
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 128 over Shearing Creek is a concrete continuous slab carrying State Route 128 over Shearing Creek in Mendocino County, California. It was built in 1939 and reconstructed in 1991, so it is 86 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,050 vehicles a day, roughly 12% of them trucks, projected to reach 3,163 by 2043. The structure is 54 ft (16.5 m) long and 35 ft wide. If it were closed, the detour would be 60.3 mi (97 km).

CarriesState Route 128
CrossesShearing Creek
Location01-MEN-128-34.49
RouteState Highway 128
Coordinates38.9426, -123.31627
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.9 US tons
Inventory rating23.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length54 ft (16.5 m)
Longest span21 ft (6.4 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,050 (2009)
Projected traffic3,163 by 2043
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed60.3 mi (97 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 128 over Shearing Creek built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1991.

What condition is State Route 128 over Shearing Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

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

About 2,050 vehicles per day (2009 count), of which roughly 12% are trucks.

How long is State Route 128 over Shearing Creek?

The structure is 54 ft (16.5 m) long with a longest span of 21 ft (6.4 m) and a deck 35 ft wide.

Who owns State Route 128 over Shearing Creek?

It is owned by the State Highway Agency.