US Bridges

State Route 271 over U.S. 101 (@ Pm R89.56)

Fair

Mendocino County, California · 01-MEN-271-5.58 · Structure no. 10 0135

Built
1970
55 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
166 ft
3 main spans
Daily traffic
750
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 271 over U.S. 101 (@ Pm R89.56) is a concrete continuous box beam or girders - multiple carrying State Route 271 over U.S. 101 (@ Pm R89.56) 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 750 vehicles a day, roughly 6% of them trucks, projected to reach 1,122 by 2041. The structure is 166 ft (50.6 m) long and 42 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesState Route 271
CrossesU.S. 101 (@ Pm R89.56)
Location01-MEN-271-5.58
RouteState Highway 271
Coordinates39.84839, -123.70782
Functional classRural Minor 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
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 geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.9 US tons
Inventory rating38.6 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length166 ft (50.6 m)
Longest span89 ft (27.1 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic750 (2009)
Projected traffic1,122 by 2041
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

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 State Route 271 over U.S. 101 (@ Pm R89.56) built?

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

What condition is State Route 271 over U.S. 101 (@ Pm R89.56) 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 State Route 271 over U.S. 101 (@ Pm R89.56) carry?

About 750 vehicles per day (2009 count), of which roughly 6% are trucks.

How long is State Route 271 over U.S. 101 (@ Pm R89.56)?

The structure is 166 ft (50.6 m) long with a longest span of 89 ft (27.1 m) and a deck 42 ft wide.

Who owns State Route 271 over U.S. 101 (@ Pm R89.56)?

It is owned by the State Highway Agency.