US Bridges

State Route 3 over Moffett Creek

Good

Siskiyou County, California · 02-SIS-003-38.26 · Structure no. 02 0206

Built
2021
4 years old
Condition
Good
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
100 ft
1 main span
Daily traffic
2,900
2021 count
Owner
State
State Highway Agency

About this bridge

State Route 3 over Moffett Creek is a prestressed concrete box beam or girders - multiple carrying State Route 3 over Moffett Creek in Siskiyou County, California. It was built in 2021, so it is 4 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 2,900 vehicles a day, projected to reach 4,127 by 2044. The structure is 100 ft (30.5 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesState Route 3
CrossesMoffett Creek
Location02-SIS-003-38.26
RouteState Highway 3
CountySiskiyou County
StateCalifornia
Coordinates41.63276, -122.75267
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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length100 ft (30.5 m)
Longest span92 ft (27.9 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,900 (2021)
Projected traffic4,127 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 State Route 3 over Moffett Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is State Route 3 over Moffett 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 September 2023.

How much traffic does State Route 3 over Moffett Creek carry?

About 2,900 vehicles per day (2021 count).

How long is State Route 3 over Moffett Creek?

The structure is 100 ft (30.5 m) long with a longest span of 92 ft (27.9 m) and a deck 44 ft wide.

Who owns State Route 3 over Moffett Creek?

It is owned by the State Highway Agency.