US Bridges

Navarro Ridge Road over Hay Creek

Fair

Mendocino County, California · 3.6 MI E JCT SR 1 · Structure no. 10C0133

Built
1980
45 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
43 ft
2 main spans
Daily traffic
417
2011 count
Owner
County
County Highway Agency

About this bridge

Navarro Ridge Road over Hay Creek is a wood or timber stringer/multi-beam or girder carrying Navarro Ridge Road over Hay Creek in Mendocino County, California. It was built in 1980, so it is 45 years old, younger 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 5 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 417 vehicles a day, roughly 5% of them trucks, projected to reach 196 by 2041. The structure is 43 ft (13.1 m) long and 16 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesNavarro Ridge Road
CrossesHay Creek
Location3.6 MI E JCT SR 1
RouteCounty Highway 0
CountyMendocino County
StateCalifornia
Coordinates39.18722, -123.70897
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating38.9 US tons
Inventory rating27.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadUnknown
Structure length43 ft (13.1 m)
Longest span20 ft (6.1 m)
Deck width16 ft (5 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic417 (2011)
Projected traffic196 by 2041
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Navarro Ridge Road over Hay Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is Navarro Ridge Road over Hay Creek 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 May 2023.

How much traffic does Navarro Ridge Road over Hay Creek carry?

About 417 vehicles per day (2011 count), of which roughly 5% are trucks.

How long is Navarro Ridge Road over Hay Creek?

The structure is 43 ft (13.1 m) long with a longest span of 20 ft (6.1 m) and a deck 16 ft wide.

Who owns Navarro Ridge Road over Hay Creek?

It is owned by the County Highway Agency.