US Bridges

Masonite Road over U.S. Highway 101

Good

Mendocino County, California · 01-MEN-101-26.37 · Structure no. 10 0197

Built
1962
63 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
214 ft
4 main spans
Daily traffic
5
2010 count
Owner
State
State Highway Agency

About this bridge

Masonite Road over U.S. Highway 101 is a concrete continuous box beam or girders - multiple carrying Masonite Road over U.S. Highway 101 in Mendocino County, California. It was built in 1962, so it is 63 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 5 vehicles a day, roughly 10% of them trucks, projected to reach 20 by 2042. The structure is 214 ft (65.2 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMasonite Road
CrossesU.S. Highway 101
Location01-MEN-101-26.37
RouteCity Street 0
Coordinates39.17623, -123.21309
Functional classUrban Local

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.
Last inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.6 US tons
Inventory rating69.3 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length214 ft (65.2 m)
Longest span62 ft (18.9 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2010)
Projected traffic20 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
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 Masonite Road over U.S. Highway 101 built?

It was built in 1962, making it 63 years old in 2025.

What condition is Masonite Road over U.S. Highway 101 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 Masonite Road over U.S. Highway 101 carry?

About 5 vehicles per day (2010 count), of which roughly 10% are trucks.

How long is Masonite Road over U.S. Highway 101?

The structure is 214 ft (65.2 m) long with a longest span of 62 ft (18.9 m) and a deck 36 ft wide.

Who owns Masonite Road over U.S. Highway 101?

It is owned by the State Highway Agency.