US Bridges

North State ST over W20-N101 Connector Ramp

Fair

Mendocino County, California · 01-MEN-020-33.32 · Structure no. 10 0208

Built
1962
63 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
176 ft
3 main spans
Daily traffic
1,943
2008 count
Owner
State
State Highway Agency

About this bridge

North State ST over W20-N101 Connector Ramp is a concrete continuous box beam or girders - multiple carrying North State ST over W20-N101 Connector Ramp 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 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 1,943 vehicles a day, roughly 4% of them trucks, projected to reach 2,773 by 2042. The structure is 176 ft (53.6 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNorth State ST
CrossesW20-N101 Connector Ramp
Location01-MEN-020-33.32
RouteCounty Highway 0
CountyMendocino County
StateCalifornia
Coordinates39.24171, -123.20658
Functional classUrban Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.2 US tons
Inventory rating35.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length176 ft (53.6 m)
Longest span72 ft (21.9 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,943 (2008)
Projected traffic2,773 by 2042
Trucks4%
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 North State ST over W20-N101 Connector Ramp built?

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

What condition is North State ST over W20-N101 Connector Ramp 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 June 2024.

How much traffic does North State ST over W20-N101 Connector Ramp carry?

About 1,943 vehicles per day (2008 count), of which roughly 4% are trucks.

How long is North State ST over W20-N101 Connector Ramp?

The structure is 176 ft (53.6 m) long with a longest span of 72 ft (21.9 m) and a deck 34 ft wide.

Who owns North State ST over W20-N101 Connector Ramp?

It is owned by the State Highway Agency.