US Bridges

Hogan Dam Road over Cosgrove Creek

Fair

Calaveras County, California · 0.1 MI E JCT SR 26 · Structure no. 30C0020

Built
1962
63 years old
Condition
Fair
inspected February 2025
Type
Culvert
Steel
Length
46 ft
5 main spans
Daily traffic
1,089
2014 count
Owner
County
County Highway Agency

About this bridge

Hogan Dam Road over Cosgrove Creek is a steel culvert carrying Hogan Dam Road over Cosgrove Creek in Calaveras County, California. It was built in 1962, so it is 63 years old, older 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 1,089 vehicles a day, roughly 2% of them trucks, projected to reach 1,779 by 2047. The structure is 46 ft (14 m) long and 22 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesHogan Dam Road
CrossesCosgrove Creek
Location0.1 MI E JCT SR 26
RouteCounty Highway 0
CountyCalaveras County
StateCalifornia
Coordinates38.18529, -120.82415
Functional classRural Major 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans5
Design loadUnknown
Structure length46 ft (14 m)
Longest span8 ft (2.5 m)
Deck width22 ft (6.8 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,089 (2014)
Projected traffic1,779 by 2047
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Hogan Dam Road over Cosgrove Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is Hogan Dam Road over Cosgrove 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 February 2025.

How much traffic does Hogan Dam Road over Cosgrove Creek carry?

About 1,089 vehicles per day (2014 count), of which roughly 2% are trucks.

How long is Hogan Dam Road over Cosgrove Creek?

The structure is 46 ft (14 m) long with a longest span of 8 ft (2.5 m) and a deck 22 ft wide.

Who owns Hogan Dam Road over Cosgrove Creek?

It is owned by the County Highway Agency.