US Bridges

Mcadams Creek RD over Moffett Creek

Fair

Siskiyou County, California · 0.25 MI N SR 3 · Structure no. 02C0092

Built
1978
47 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
62 ft
2 main spans
Daily traffic
256
2011 count
Owner
County
County Highway Agency

About this bridge

Mcadams Creek RD over Moffett Creek is a concrete continuous slab carrying Mcadams Creek RD over Moffett Creek in Siskiyou County, California. It was built in 1978, so it is 47 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 6 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 256 vehicles a day, roughly 5% of them trucks, projected to reach 349 by 2041. The structure is 62 ft (19 m) long and 25 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

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CarriesMcadams Creek RD
CrossesMoffett Creek
Location0.25 MI N SR 3
RouteCounty Highway 0
CountySiskiyou County
StateCalifornia
Coordinates41.62793, -122.82864
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96.8 US tons
Inventory rating58.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length62 ft (19 m)
Longest span30 ft (9.1 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic256 (2011)
Projected traffic349 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 Mcadams Creek RD over Moffett Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Mcadams 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 Mcadams Creek RD over Moffett Creek carry?

About 256 vehicles per day (2011 count), of which roughly 5% are trucks.

How long is Mcadams Creek RD over Moffett Creek?

The structure is 62 ft (19 m) long with a longest span of 30 ft (9.1 m) and a deck 25 ft wide.

Who owns Mcadams Creek RD over Moffett Creek?

It is owned by the County Highway Agency.