US Bridges

Mcadams Creek RD over Mcadams Creek

Fair

Siskiyou County, California · 2.55 MI N SR 3 · Structure no. 02C0190

Built
1975
50 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
256
2011 count
Owner
County
County Highway Agency

About this bridge

Mcadams Creek RD over Mcadams Creek is a steel stringer/multi-beam or girder carrying Mcadams Creek RD over Mcadams 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 256 vehicles a day, roughly 10% of them trucks, projected to reach 349 by 2041. The structure is 40 ft (12.3 m) long and 25 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesMcadams Creek RD
CrossesMcadams Creek
Location2.55 MI N SR 3
RouteCounty Highway 0
Coordinates41.65653, -122.83578
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
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 protection6 SatisfactoryStructural elements show some minor deterioration.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating105.7 US tons
Inventory rating81.5 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length40 ft (12.3 m)
Longest span38 ft (11.6 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
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 Mcadams Creek RD over Mcadams Creek built?

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

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

About 256 vehicles per day (2011 count), of which roughly 10% are trucks.

How long is Mcadams Creek RD over Mcadams Creek?

The structure is 40 ft (12.3 m) long with a longest span of 38 ft (11.6 m) and a deck 25 ft wide.

Who owns Mcadams Creek RD over Mcadams Creek?

It is owned by the County Highway Agency.