US Bridges

U.S. Highway 101 over CO RD South Fork Eel Riv

Good

Mendocino County, California · 01-MEN-101-R106.57 · Structure no. 10 0218

Built
1970
55 years old, rebuilt 2023
Condition
Good
inspected April 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
505 ft
2 main spans
Daily traffic
6,100
2009 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over CO RD South Fork Eel Riv is a prestressed concrete continuous box beam or girders - multiple carrying U.S. Highway 101 over CO RD South Fork Eel Riv in Mendocino County, California. It was built in 1970 and reconstructed in 2023, so it is 55 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 6,100 vehicles a day, roughly 14% of them trucks, projected to reach 6,733 by 2041. The structure is 505 ft (154 m) long and 62 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesU.S. Highway 101
CrossesCO RD South Fork Eel Riv
Location01-MEN-101-R106.57
RouteU.S. Route 101
Coordinates39.99925, -123.78581
Functional classRural Principal Arterial - Other

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 protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length505 ft (154 m)
Longest span249 ft (75.9 m)
Deck width62 ft (18.9 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,100 (2009)
Projected traffic6,733 by 2041
Trucks14%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed123.7 mi (199 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 CO RD South Fork Eel Riv built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 2023.

What condition is U.S. Highway 101 over CO RD South Fork Eel Riv 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 2024.

How much traffic does U.S. Highway 101 over CO RD South Fork Eel Riv carry?

About 6,100 vehicles per day (2009 count), of which roughly 14% are trucks.

How long is U.S. Highway 101 over CO RD South Fork Eel Riv?

The structure is 505 ft (154 m) long with a longest span of 249 ft (75.9 m) and a deck 62 ft wide.

Who owns U.S. Highway 101 over CO RD South Fork Eel Riv?

It is owned by the State Highway Agency.