US Bridges

U.S. Highway 101 over Rattlesnake Creek

Fair

Mendocino County, California · 01-MEN-101-81.43 · Structure no. 10 0027

Built
1931
94 years old, rebuilt 1959
Condition
Fair
inspected April 2024
Type
Arch - Deck
Concrete
Length
24 ft
1 main span
Daily traffic
6,200
2009 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Rattlesnake Creek is a concrete arch - deck carrying U.S. Highway 101 over Rattlesnake Creek in Mendocino County, California. It was built in 1931 and reconstructed in 1959, so it is 94 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 6,200 vehicles a day, projected to reach 8,263 by 2041. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 46 mi (74 km).

Location

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CarriesU.S. Highway 101
CrossesRattlesnake Creek
Location01-MEN-101-81.43
RouteU.S. Route 101
CountyMendocino County
StateCalifornia
Coordinates39.82824, -123.57698
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: 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 rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span22 ft (6.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,200 (2009)
Projected traffic8,263 by 2041
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed46 mi (74 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was U.S. Highway 101 over Rattlesnake Creek built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1959.

What condition is U.S. Highway 101 over Rattlesnake 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 April 2024.

How much traffic does U.S. Highway 101 over Rattlesnake Creek carry?

About 6,200 vehicles per day (2009 count).

How long is U.S. Highway 101 over Rattlesnake Creek?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.6 m).

Who owns U.S. Highway 101 over Rattlesnake Creek?

It is owned by the State Highway Agency.