US Bridges

Forest Road 360 over North Fk of S Fk Noyo

Good

Mendocino County, California · 1 MI N Road 300 · Structure no. 10F0012

Built
1958
67 years old, rebuilt 2017
Condition
Good
inspected May 2023
Type
Slab
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
30
2018 count
Owner
State
State Park, Forest, or Reservation Agency

About this bridge

Forest Road 360 over North Fk of S Fk Noyo is a prestressed concrete slab carrying Forest Road 360 over North Fk of S Fk Noyo in Mendocino County, California. It was built in 1958 and reconstructed in 2017, so it is 67 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 30 vehicles a day, projected to reach 41 by 2045. The structure is 40 ft (12.2 m) long and 20 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesForest Road 360
CrossesNorth Fk of S Fk Noyo
Location1 MI N Road 300
RouteState Lands Road 0
Coordinates39.40386, -123.68135
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.
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 evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37.8 US tons
Inventory rating28.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length40 ft (12.2 m)
Longest span38 ft (11.6 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2018)
Projected traffic41 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Park, Forest, or Reservation Agency
Maintained byState Park, Forest, or Reservation 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 Forest Road 360 over North Fk of S Fk Noyo built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 2017.

What condition is Forest Road 360 over North Fk of S Fk Noyo 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 Forest Road 360 over North Fk of S Fk Noyo carry?

About 30 vehicles per day (2018 count).

How long is Forest Road 360 over North Fk of S Fk Noyo?

The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.6 m) and a deck 20 ft wide.

Who owns Forest Road 360 over North Fk of S Fk Noyo?

It is owned by the State Park, Forest, or Reservation Agency.