US Bridges

State Route 101 over Ncrra/Nwp RR

Fair

Mendocino County, California · 01-MEN-020-35.63 · Structure no. 10 0125

Built
1969
56 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
105 ft
1 main span
Daily traffic
13,500
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 101 over Ncrra/Nwp RR is a prestressed concrete stringer/multi-beam or girder carrying State Route 101 over Ncrra/Nwp RR in Mendocino County, California. It was built in 1969, so it is 56 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 6 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 13,500 vehicles a day, roughly 5% of them trucks, projected to reach 25,609 by 2045. The structure is 105 ft (32 m) long and 42 ft wide. If it were closed, the detour would be 65.9 mi (106 km).

Location

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CarriesState Route 101
CrossesNcrra/Nwp RR
Location01-MEN-020-35.63
RouteState Highway 20
CountyMendocino County
StateCalifornia
Coordinates39.37563, -123.32955
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.7 US tons
Inventory rating22.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length105 ft (32 m)
Longest span103 ft (31.5 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,500 (2009)
Projected traffic25,609 by 2045
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed65.9 mi (106 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 State Route 101 over Ncrra/Nwp RR built?

It was built in 1969, making it 56 years old in 2025.

What condition is State Route 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 May 2023.

How much traffic does State Route 101 over Ncrra/Nwp RR carry?

About 13,500 vehicles per day (2009 count), of which roughly 5% are trucks.

How long is State Route 101 over Ncrra/Nwp RR?

The structure is 105 ft (32 m) long with a longest span of 103 ft (31.5 m) and a deck 42 ft wide.

Who owns State Route 101 over Ncrra/Nwp RR?

It is owned by the State Highway Agency.