US Bridges

U.S. Highway 101 over Ncrra/Nwp RR

Fair

Mendocino County, California · 01-MEN-101-R9.53 · Structure no. 10 0081

Built
1966
59 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
311 ft
5 main spans
Daily traffic
13,800
2009 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Ncrra/Nwp RR is a concrete continuous box beam or girders - multiple carrying U.S. Highway 101 over Ncrra/Nwp RR in Mendocino County, California. It was built in 1966, so it is 59 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 13,800 vehicles a day, roughly 11% of them trucks, projected to reach 22,546 by 2043. The structure is 311 ft (94.8 m) long and 34 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesU.S. Highway 101
CrossesNcrra/Nwp RR
Location01-MEN-101-R9.53
RouteU.S. Route 101
CountyMendocino County
StateCalifornia
Coordinates38.95489, -123.1046
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.4 US tons
Inventory rating28.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length311 ft (94.8 m)
Longest span70 ft (21.3 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,800 (2009)
Projected traffic22,546 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed5 mi (8 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 Ncrra/Nwp RR built?

It was built in 1966, making it 59 years old in 2025.

What condition is U.S. Highway 101 over Ncrra/Nwp RR 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 2023.

How much traffic does U.S. Highway 101 over Ncrra/Nwp RR carry?

About 13,800 vehicles per day (2009 count), of which roughly 11% are trucks.

How long is U.S. Highway 101 over Ncrra/Nwp RR?

The structure is 311 ft (94.8 m) long with a longest span of 70 ft (21.3 m) and a deck 34 ft wide.

Who owns U.S. Highway 101 over Ncrra/Nwp RR?

It is owned by the State Highway Agency.