US Bridges

State Route 271 over U.S. 101 (@ Pm R101.90)

Fair

Mendocino County, California · 01-MEN-271-17.03 · Structure no. 10 0217

Built
1976
49 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
155 ft
1 main span
Daily traffic
810
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 271 over U.S. 101 (@ Pm R101.90) is a prestressed concrete box beam or girders - multiple carrying State Route 271 over U.S. 101 (@ Pm R101.90) in Mendocino County, California. It was built in 1976, so it is 49 years old, younger 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 810 vehicles a day, roughly 7% of them trucks, projected to reach 944 by 2041. The structure is 155 ft (47.2 m) long and 42 ft wide.

Location

Open in Google Maps
CarriesState Route 271
CrossesU.S. 101 (@ Pm R101.90)
Location01-MEN-271-17.03
RouteState Highway 271
CountyMendocino County
StateCalifornia
Coordinates39.94396, -123.77947
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 geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length155 ft (47.2 m)
Longest span153 ft (46.5 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic810 (2009)
Projected traffic944 by 2041
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 R101.90) built?

It was built in 1976, making it 49 years old in 2025.

What condition is State Route 271 over U.S. 101 (@ Pm R101.90) 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 R101.90) carry?

About 810 vehicles per day (2009 count), of which roughly 7% are trucks.

How long is State Route 271 over U.S. 101 (@ Pm R101.90)?

The structure is 155 ft (47.2 m) long with a longest span of 153 ft (46.5 m) and a deck 42 ft wide.

Who owns State Route 271 over U.S. 101 (@ Pm R101.90)?

It is owned by the State Highway Agency.