US Bridges

SR 001 over Westport North Sidehill

Good

Mendocino County, California · 01-MEN-001-83.30 · Structure no. 10 0309

Built
2018
7 years old
Condition
Good
inspected September 2023
Type
Slab
Prestressed Concrete
Length
62 ft
1 main span
Daily traffic
830
2009 count
Owner
State
State Highway Agency

About this bridge

SR 001 over Westport North Sidehill is a prestressed concrete slab carrying SR 001 over Westport North Sidehill in Mendocino County, California. It was built in 2018, so it is 7 years old, younger 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 830 vehicles a day, projected to reach 2,100 by 2043. The structure is 62 ft (18.9 m) long and 18 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR 001
CrossesWestport North Sidehill
Location01-MEN-001-83.30
RouteState Highway 1
CountyMendocino County
StateCalifornia
Coordinates39.69363, -123.7973
Functional classRural Minor Arterial

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.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 48 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 rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length62 ft (18.9 m)
Longest span60 ft (18.3 m)
Deck width18 ft (5.5 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic830 (2009)
Projected traffic2,100 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed3.1 mi (5 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 SR 001 over Westport North Sidehill built?

It was built in 2018, making it 7 years old in 2025.

What condition is SR 001 over Westport North Sidehill 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 September 2023.

How much traffic does SR 001 over Westport North Sidehill carry?

About 830 vehicles per day (2009 count).

How long is SR 001 over Westport North Sidehill?

The structure is 62 ft (18.9 m) long with a longest span of 60 ft (18.3 m) and a deck 18 ft wide.

Who owns SR 001 over Westport North Sidehill?

It is owned by the State Highway Agency.