US Bridges

Stockton BL-S99 on over State Route 99

Poor

Sacramento County, California · 03-SAC-099-17.24-SAC · Structure no. 24 0134K

Built
1959
66 years old
Condition
Poor
inspected February 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
289 ft
4 main spans
Daily traffic
8,500
2019 count
Owner
State
State Highway Agency

About this bridge

Stockton BL-S99 on over State Route 99 is a concrete continuous box beam or girders - multiple carrying Stockton BL-S99 on over State Route 99 in Sacramento County, California. It was built in 1959, so it is 66 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 8,500 vehicles a day, roughly 2% of them trucks, projected to reach 11,892 by 2042. The structure is 289 ft (88.1 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesStockton BL-S99 on
CrossesState Route 99
Location03-SAC-099-17.24-SAC
RouteState Highway 99
Coordinates38.46938, -121.41796
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length289 ft (88.1 m)
Longest span97 ft (29.7 m)
Deck width27 ft (8.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,500 (2019)
Projected traffic11,892 by 2042
Trucks2%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Stockton BL-S99 on over State Route 99 built?

It was built in 1959, making it 66 years old in 2025.

What condition is Stockton BL-S99 on over State Route 99 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2024.

How much traffic does Stockton BL-S99 on over State Route 99 carry?

About 8,500 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is Stockton BL-S99 on over State Route 99?

The structure is 289 ft (88.1 m) long with a longest span of 97 ft (29.7 m) and a deck 27 ft wide.

Who owns Stockton BL-S99 on over State Route 99?

It is owned by the State Highway Agency.