US Bridges

State Route 128 over Anderson Creek

Fair

Mendocino County, California · 01-MEN-128-28.29 · Structure no. 10 0132

Built
2005
20 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Concrete
Length
135 ft
1 main span
Daily traffic
5,200
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 128 over Anderson Creek is a concrete box beam or girders - multiple carrying State Route 128 over Anderson Creek in Mendocino County, California. It was built in 2005, so it is 20 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 5,200 vehicles a day, roughly 11% of them trucks, projected to reach 7,384 by 2043. The structure is 135 ft (41 m) long and 54 ft wide. If it were closed, the detour would be 44.1 mi (71 km).

CarriesState Route 128
CrossesAnderson Creek
Location01-MEN-128-28.29
RouteState Highway 128
Coordinates39.01421, -123.37294
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
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 geometry9: Superior to present desirable criteria
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

MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length135 ft (41 m)
Longest span131 ft (40 m)
Deck width54 ft (16.5 m)
Roadway width51 ft (15.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,200 (2009)
Projected traffic7,384 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed44.1 mi (71 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 Anderson Creek built?

It was built in 2005, making it 20 years old in 2025.

What condition is State Route 128 over Anderson 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 State Route 128 over Anderson Creek carry?

About 5,200 vehicles per day (2009 count), of which roughly 11% are trucks.

How long is State Route 128 over Anderson Creek?

The structure is 135 ft (41 m) long with a longest span of 131 ft (40 m) and a deck 54 ft wide.

Who owns State Route 128 over Anderson Creek?

It is owned by the State Highway Agency.