US Bridges

Branscomb RD over Windem Creek

Fair

Mendocino County, California · 19.45 MI E from SH 1 · Structure no. 10C0099

Built
1950
75 years old
Condition
Fair
inspected August 2024
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
406
2011 count
Owner
County
County Highway Agency

About this bridge

Branscomb RD over Windem Creek is a concrete continuous culvert carrying Branscomb RD over Windem Creek in Mendocino County, California. It was built in 1950, so it is 75 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 6 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 406 vehicles a day, roughly 10% of them trucks, projected to reach 431 by 2046. The structure is 22 ft (6.7 m) long and 32 ft wide. If it were closed, the detour would be 95.7 mi (154 km).

Location

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CarriesBranscomb RD
CrossesWindem Creek
Location19.45 MI E from SH 1
RouteCounty Highway 0
CountyMendocino County
StateCalifornia
Coordinates39.62749, -123.53893
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3.2 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic406 (2011)
Projected traffic431 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed95.7 mi (154 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Branscomb RD over Windem Creek built?

It was built in 1950, making it 75 years old in 2025.

What condition is Branscomb RD over Windem 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 August 2024.

How much traffic does Branscomb RD over Windem Creek carry?

About 406 vehicles per day (2011 count), of which roughly 10% are trucks.

How long is Branscomb RD over Windem Creek?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3.2 m) and a deck 32 ft wide.

Who owns Branscomb RD over Windem Creek?

It is owned by the County Highway Agency.