US Bridges

Mount Aukum Road over North Fk Cosumnes River

Good

El Dorado County, California · 2.6 MI S Pleasant Valy RD · Structure no. 25C0016

Built
1960
65 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
259 ft
3 main spans
Daily traffic
1,746
2012 count
Owner
County
County Highway Agency

About this bridge

Mount Aukum Road over North Fk Cosumnes River is a steel stringer/multi-beam or girder carrying Mount Aukum Road over North Fk Cosumnes River in El Dorado County, California. It was built in 1960, so it is 65 years old, older 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 1,746 vehicles a day, roughly 10% of them trucks, projected to reach 4,436 by 2043. The structure is 259 ft (78.9 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesMount Aukum Road
CrossesNorth Fk Cosumnes River
Location2.6 MI S Pleasant Valy RD
RouteCounty Highway 0
Coordinates38.65878, -120.67804
Functional classRural Major Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51.8 US tons
Inventory rating34 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length259 ft (78.9 m)
Longest span85 ft (25.9 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,746 (2012)
Projected traffic4,436 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Mount Aukum Road over North Fk Cosumnes River built?

It was built in 1960, making it 65 years old in 2025.

What condition is Mount Aukum Road over North Fk Cosumnes River 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 June 2023.

How much traffic does Mount Aukum Road over North Fk Cosumnes River carry?

About 1,746 vehicles per day (2012 count), of which roughly 10% are trucks.

How long is Mount Aukum Road over North Fk Cosumnes River?

The structure is 259 ft (78.9 m) long with a longest span of 85 ft (25.9 m) and a deck 32 ft wide.

Who owns Mount Aukum Road over North Fk Cosumnes River?

It is owned by the County Highway Agency.