US Bridges

State Route 1 over Hathaway Creek

Good

Mendocino County, California · 01-MEN-001-17.67 · Structure no. 10 0294

Built
1995
30 years old
Condition
Good
inspected August 2024
Type
Slab
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
2,100
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over Hathaway Creek is a prestressed concrete slab carrying State Route 1 over Hathaway Creek in Mendocino County, California. It was built in 1995, so it is 30 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 2,100 vehicles a day, roughly 16% of them trucks, projected to reach 3,173 by 2042. The structure is 40 ft (12.2 m) long and 36 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesState Route 1
CrossesHathaway Creek
Location01-MEN-001-17.67
RouteState Highway 1
CountyMendocino County
StateCalifornia
Coordinates38.93617, -123.70843
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
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 loadHS 20 + Mod
Structure length40 ft (12.2 m)
Longest span38 ft (11.7 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,100 (2009)
Projected traffic3,173 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 1 over Hathaway Creek built?

It was built in 1995, making it 30 years old in 2025.

What condition is State Route 1 over Hathaway Creek 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 August 2024.

How much traffic does State Route 1 over Hathaway Creek carry?

About 2,100 vehicles per day (2009 count), of which roughly 16% are trucks.

How long is State Route 1 over Hathaway Creek?

The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.7 m) and a deck 36 ft wide.

Who owns State Route 1 over Hathaway Creek?

It is owned by the State Highway Agency.