US Bridges

U.S. Highway 101 over ST RTE 271 (@ Pm 19.46)

Fair

Mendocino County, California · 01-MEN-101-R103.81 · Structure no. 10 0091

Built
1970
55 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
111 ft
1 main span
Daily traffic
6,100
2009 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over ST RTE 271 (@ Pm 19.46) is a prestressed concrete box beam or girders - multiple carrying U.S. Highway 101 over ST RTE 271 (@ Pm 19.46) in Mendocino County, California. It was built in 1970, so it is 55 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 6,100 vehicles a day, roughly 14% of them trucks, projected to reach 6,835 by 2041. The structure is 111 ft (33.8 m) long and 82 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesU.S. Highway 101
CrossesST RTE 271 (@ Pm 19.46)
Location01-MEN-101-R103.81
RouteU.S. Route 101
CountyMendocino County
StateCalifornia
Coordinates39.96584, -123.79482
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating32.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length111 ft (33.8 m)
Longest span110 ft (33.5 m)
Deck width82 ft (25 m)
Roadway width80 ft (24.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,100 (2009)
Projected traffic6,835 by 2041
Trucks14%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed123.7 mi (199 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 ST RTE 271 (@ Pm 19.46) built?

It was built in 1970, making it 55 years old in 2025.

What condition is U.S. Highway 101 over ST RTE 271 (@ Pm 19.46) 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 ST RTE 271 (@ Pm 19.46) carry?

About 6,100 vehicles per day (2009 count), of which roughly 14% are trucks.

How long is U.S. Highway 101 over ST RTE 271 (@ Pm 19.46)?

The structure is 111 ft (33.8 m) long with a longest span of 110 ft (33.5 m) and a deck 82 ft wide.

Who owns U.S. Highway 101 over ST RTE 271 (@ Pm 19.46)?

It is owned by the State Highway Agency.