US Bridges

County Road 316 over Shelly Creek

Fair

Del Norte County, California · 9.3 MI N of US HWY 199 · Structure no. 01C0035

Built
1975
50 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
26 ft
1 main span
Daily traffic
50
1979 count
Owner
County
County Highway Agency

About this bridge

County Road 316 over Shelly Creek is a wood or timber stringer/multi-beam or girder carrying County Road 316 over Shelly Creek in Del Norte County, California. It was built in 1975, so it is 50 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 50 vehicles a day, projected to reach 55 by 2041. The structure is 26 ft (7.8 m) long and 15 ft wide. If it were closed, the detour would be 36.7 mi (59 km).

Location

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CarriesCounty Road 316
CrossesShelly Creek
Location9.3 MI N of US HWY 199
RouteCounty Highway 0
CountyDel Norte County
StateCalifornia
Coordinates41.96675, -123.80815
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating47.5 US tons
Inventory rating34.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadUnknown
Structure length26 ft (7.8 m)
Longest span24 ft (7.2 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (1979)
Projected traffic55 by 2041
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed36.7 mi (59 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 County Road 316 over Shelly Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is County Road 316 over Shelly 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 June 2023.

How much traffic does County Road 316 over Shelly Creek carry?

About 50 vehicles per day (1979 count).

How long is County Road 316 over Shelly Creek?

The structure is 26 ft (7.8 m) long with a longest span of 24 ft (7.2 m) and a deck 15 ft wide.

Who owns County Road 316 over Shelly Creek?

It is owned by the County Highway Agency.