US Bridges

Robinson Oc over U.S. Highway 101

Good

Mendocino County, California · 01-MEN-101-20.71 · Structure no. 10 0086

Built
1963
62 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
171 ft
2 main spans
Daily traffic
500
2010 count
Owner
State
State Highway Agency

About this bridge

Robinson Oc over U.S. Highway 101 is a prestressed concrete stringer/multi-beam or girder carrying Robinson Oc over U.S. Highway 101 in Mendocino County, California. It was built in 1963, so it is 62 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 500 vehicles a day, roughly 2% of them trucks, projected to reach 661 by 2043. The structure is 171 ft (52.1 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesRobinson Oc
CrossesU.S. Highway 101
Location01-MEN-101-20.71
RouteCounty Highway 0
Coordinates39.09725, -123.18989
Functional classRural Local

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.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating40.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length171 ft (52.1 m)
Longest span83 ft (25.3 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2010)
Projected traffic661 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 Robinson Oc over U.S. Highway 101 built?

It was built in 1963, making it 62 years old in 2025.

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

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

About 500 vehicles per day (2010 count), of which roughly 2% are trucks.

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

The structure is 171 ft (52.1 m) long with a longest span of 83 ft (25.3 m) and a deck 34 ft wide.

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

It is owned by the State Highway Agency.