US Bridges

State Route 49 over Jackson Creek

Good

Amador County, California · 10-AMA-049-4.10-JKN · Structure no. 26 0035

Built
1948
77 years old, rebuilt 1969
Condition
Good
inspected April 2023
Type
Tee Beam
Concrete Continuous
Length
164 ft
5 main spans
Daily traffic
19,800
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 49 over Jackson Creek is a concrete continuous tee beam carrying State Route 49 over Jackson Creek in Amador County, California. It was built in 1948 and reconstructed in 1969, so it is 77 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 19,800 vehicles a day, roughly 7% of them trucks, projected to reach 22,945 by 2041. The structure is 164 ft (50 m) long and 76 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesState Route 49
CrossesJackson Creek
Location10-AMA-049-4.10-JKN
RouteState Highway 49
Coordinates38.34754, -120.77385
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.4 US tons
Inventory rating48.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length164 ft (50 m)
Longest span48 ft (14.6 m)
Deck width76 ft (23.3 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,800 (2009)
Projected traffic22,945 by 2041
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 49 over Jackson Creek built?

It was built in 1948, making it 77 years old in 2025. It was reconstructed in 1969.

What condition is State Route 49 over Jackson Creek 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 April 2023.

How much traffic does State Route 49 over Jackson Creek carry?

About 19,800 vehicles per day (2009 count), of which roughly 7% are trucks.

How long is State Route 49 over Jackson Creek?

The structure is 164 ft (50 m) long with a longest span of 48 ft (14.6 m) and a deck 76 ft wide.

Who owns State Route 49 over Jackson Creek?

It is owned by the State Highway Agency.