US Bridges

Forest Road 200 over Chamberlain Creek

Good

Mendocino County, California · 1.0 MI N JCT SR 20 · Structure no. 10F0013

Built
1958
67 years old, rebuilt 2021
Condition
Good
inspected May 2023
Type
Slab
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
75
2009 count
Owner
State
State Park, Forest, or Reservation Agency

About this bridge

Forest Road 200 over Chamberlain Creek is a prestressed concrete slab carrying Forest Road 200 over Chamberlain Creek in Mendocino County, California. It was built in 1958 and reconstructed in 2021, 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 75 vehicles a day, projected to reach 98 by 2041. The structure is 31 ft (9.6 m) long and 16 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesForest Road 200
CrossesChamberlain Creek
Location1.0 MI N JCT SR 20
RouteState Lands Road 0
CountyMendocino County
StateCalifornia
Coordinates39.36362, -123.56189
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 within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length31 ft (9.6 m)
Longest span27 ft (8.2 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2009)
Projected traffic98 by 2041
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 200 over Chamberlain Creek built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 2021.

What condition is Forest Road 200 over Chamberlain Creek 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 200 over Chamberlain Creek carry?

About 75 vehicles per day (2009 count).

How long is Forest Road 200 over Chamberlain Creek?

The structure is 31 ft (9.6 m) long with a longest span of 27 ft (8.2 m) and a deck 16 ft wide.

Who owns Forest Road 200 over Chamberlain Creek?

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