US Bridges

US Highway 101 SB over Ncra/Nwp Ford Masonite

Good

Mendocino County, California · 01-MEN-101-R25.72 · Structure no. 10 0195L

Built
1964
61 years old
Condition
Good
inspected October 2024
Type
Tee Beam
Concrete Continuous
Length
430 ft
6 main spans
Daily traffic
10,450
2009 count
Owner
State
State Highway Agency

About this bridge

US Highway 101 SB over Ncra/Nwp Ford Masonite is a concrete continuous tee beam carrying US Highway 101 SB over Ncra/Nwp Ford Masonite in Mendocino County, California. It was built in 1964, so it is 61 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10,450 vehicles a day, roughly 11% of them trucks, projected to reach 13,405 by 2042. The structure is 430 ft (131 m) long and 40 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS Highway 101 SB
CrossesNcra/Nwp Ford Masonite
Location01-MEN-101-R25.72
RouteU.S. Route 101
CountyMendocino County
StateCalifornia
Coordinates39.16703, -123.20478
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.3 US tons
Inventory rating23.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6 (+4 approach)
Design loadHS 20 + Mod
Structure length430 ft (131 m)
Longest span93 ft (28.3 m)
Deck width40 ft (12.2 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,450 (2009)
Projected traffic13,405 by 2042
Trucks11%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway, waterway and railroad
Detour if closed3.1 mi (5 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US Highway 101 SB over Ncra/Nwp Ford Masonite built?

It was built in 1964, making it 61 years old in 2025.

What condition is US Highway 101 SB over Ncra/Nwp Ford Masonite in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does US Highway 101 SB over Ncra/Nwp Ford Masonite carry?

About 10,450 vehicles per day (2009 count), of which roughly 11% are trucks.

How long is US Highway 101 SB over Ncra/Nwp Ford Masonite?

The structure is 430 ft (131 m) long with a longest span of 93 ft (28.3 m) and a deck 40 ft wide.

Who owns US Highway 101 SB over Ncra/Nwp Ford Masonite?

It is owned by the State Highway Agency.