US Bridges

U.S. Highway 101 over Ncrra/Nwp RR

Fair

Mendocino County, California · 01-MEN-101-42.09 · Structure no. 10 0001

Built
1957
68 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
158 ft
3 main spans
Daily traffic
19,000
2009 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Ncrra/Nwp RR is a steel stringer/multi-beam or girder carrying U.S. Highway 101 over Ncrra/Nwp RR in Mendocino County, California. It was built in 1957, so it is 68 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 19,000 vehicles a day, projected to reach 25,482 by 2045. The structure is 158 ft (48.2 m) long and 64 ft wide. If it were closed, the detour would be 70.2 mi (113 km).

Location

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CarriesU.S. Highway 101
CrossesNcrra/Nwp RR
Location01-MEN-101-42.09
RouteU.S. Route 101
CountyMendocino County
StateCalifornia
Coordinates39.35483, -123.31993
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.1 US tons
Inventory rating36.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length158 ft (48.2 m)
Longest span52 ft (15.7 m)
Deck width64 ft (19.4 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,000 (2009)
Projected traffic25,482 by 2045
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed70.2 mi (113 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 1957, making it 68 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 19,000 vehicles per day (2009 count).

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

The structure is 158 ft (48.2 m) long with a longest span of 52 ft (15.7 m) and a deck 64 ft wide.

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

It is owned by the State Highway Agency.