US Bridges

Forest Road 200 over West Chamberlain Creek

Fair

Mendocino County, California · 1.4 MI N JCT SR 20 · Structure no. 10F0016

Built
1957
68 years old, rebuilt 2019
Condition
Fair
inspected May 2023
Type
Slab
Prestressed Concrete
Length
27 ft
1 main span
Daily traffic
75
2009 count
Owner
State
State Park, Forest, or Reservation Agency

About this bridge

Forest Road 200 over West Chamberlain Creek is a prestressed concrete slab carrying Forest Road 200 over West Chamberlain Creek in Mendocino County, California. It was built in 1957 and reconstructed in 2019, so it is 68 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 75 vehicles a day, projected to reach 98 by 2045. The structure is 27 ft (8.2 m) long and 16 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesForest Road 200
CrossesWest Chamberlain Creek
Location1.4 MI N JCT SR 20
RouteState Lands Road 0
CountyMendocino County
StateCalifornia
Coordinates39.36607, -123.56062
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length27 ft (8.2 m)
Longest span24 ft (7.3 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 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 West Chamberlain Creek built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 2019.

What condition is Forest Road 200 over West Chamberlain 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 May 2023.

How much traffic does Forest Road 200 over West Chamberlain Creek carry?

About 75 vehicles per day (2009 count).

How long is Forest Road 200 over West Chamberlain Creek?

The structure is 27 ft (8.2 m) long with a longest span of 24 ft (7.3 m) and a deck 16 ft wide.

Who owns Forest Road 200 over West Chamberlain Creek?

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