US Bridges

U.S. Highway 101 over Robinson Creek

Fair

Mendocino County, California · 01-MEN-101-20.91 · Structure no. 10 0005L

Built
1940
85 years old
Condition
Fair
inspected April 2023
Type
Tee Beam
Concrete Continuous
Length
176 ft
6 main spans
Daily traffic
7,350
2009 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Robinson Creek is a concrete continuous tee beam carrying U.S. Highway 101 over Robinson Creek in Mendocino County, California. It was built in 1940, so it is 85 years old, older 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 7,350 vehicles a day, projected to reach 11,630 by 2043. The structure is 176 ft (53.6 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesU.S. Highway 101
CrossesRobinson Creek
Location01-MEN-101-20.91
RouteU.S. Route 101
CountyMendocino County
StateCalifornia
Coordinates39.09986, -123.19128
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.3 US tons
Inventory rating22.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadH 15
Structure length176 ft (53.6 m)
Longest span35 ft (10.7 m)
Deck width30 ft (9.2 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,350 (2009)
Projected traffic11,630 by 2043
Trucks0%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 U.S. Highway 101 over Robinson Creek built?

It was built in 1940, making it 85 years old in 2025.

What condition is U.S. Highway 101 over Robinson 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 April 2023.

How much traffic does U.S. Highway 101 over Robinson Creek carry?

About 7,350 vehicles per day (2009 count).

How long is U.S. Highway 101 over Robinson Creek?

The structure is 176 ft (53.6 m) long with a longest span of 35 ft (10.7 m) and a deck 30 ft wide.

Who owns U.S. Highway 101 over Robinson Creek?

It is owned by the State Highway Agency.