US Bridges

Moffett Creek RD over Moffett Creek

Fair

Siskiyou County, California · 4.4 MI E SR 3 · Structure no. 02C0179

Built
1975
50 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
145
2011 count
Owner
County
County Highway Agency

About this bridge

Moffett Creek RD over Moffett Creek is a steel stringer/multi-beam or girder carrying Moffett Creek RD over Moffett Creek in Siskiyou 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 145 vehicles a day, roughly 10% of them trucks, projected to reach 132 by 2041. The structure is 60 ft (18.4 m) long and 18 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesMoffett Creek RD
CrossesMoffett Creek
Location4.4 MI E SR 3
RouteCounty Highway 0
CountySiskiyou County
StateCalifornia
Coordinates41.60519, -122.73535
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating55.3 US tons
Inventory rating42.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length60 ft (18.4 m)
Longest span59 ft (18.1 m)
Deck width18 ft (5.6 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic145 (2011)
Projected traffic132 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Moffett Creek RD over Moffett Creek built?

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

What condition is Moffett Creek RD over Moffett 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 July 2023.

How much traffic does Moffett Creek RD over Moffett Creek carry?

About 145 vehicles per day (2011 count), of which roughly 10% are trucks.

How long is Moffett Creek RD over Moffett Creek?

The structure is 60 ft (18.4 m) long with a longest span of 59 ft (18.1 m) and a deck 18 ft wide.

Who owns Moffett Creek RD over Moffett Creek?

It is owned by the County Highway Agency.