US Bridges

Boulder Creek RD over Boulder Creek

Good

Siskiyou County, California · 0.4 MI E Canyon Crk RD · Structure no. 02C0188

Built
1993
32 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
74 ft
1 main span
Daily traffic
8
2011 count
Owner
County
County Highway Agency

About this bridge

Boulder Creek RD over Boulder Creek is a steel stringer/multi-beam or girder carrying Boulder Creek RD over Boulder Creek in Siskiyou County, California. It was built in 1993, so it is 32 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 8 vehicles a day, roughly 1% of them trucks, projected to reach 32 by 2042. The structure is 74 ft (22.6 m) long and 13 ft wide.

CarriesBoulder Creek RD
CrossesBoulder Creek
Location0.4 MI E Canyon Crk RD
RouteCounty Highway 0
Coordinates41.63248, -123.09752
Functional classRural Local

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 protection8 Very GoodNo problems noted.
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating65 US tons
Inventory rating38.9 US tons

Structure

MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length74 ft (22.6 m)
Longest span69 ft (20.9 m)
Deck width13 ft (3.9 m)
Roadway width10 ft (3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8 (2011)
Projected traffic32 by 2042
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Boulder Creek RD over Boulder Creek built?

It was built in 1993, making it 32 years old in 2025.

What condition is Boulder Creek RD over Boulder 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 Boulder Creek RD over Boulder Creek carry?

About 8 vehicles per day (2011 count), of which roughly 1% are trucks.

How long is Boulder Creek RD over Boulder Creek?

The structure is 74 ft (22.6 m) long with a longest span of 69 ft (20.9 m) and a deck 13 ft wide.

Who owns Boulder Creek RD over Boulder Creek?

It is owned by the County Highway Agency.