US Bridges

STOCKTON-S99 Onrmp over Union House Creek

Fair

Sacramento County, California · 03-SAC-099-17.32-SAC · Structure no. 24 0179K

Built
1961
64 years old
Condition
Fair
inspected February 2024
Type
Culvert
Concrete Continuous
Length
29 ft
3 main spans
Daily traffic
5,900
2019 count
Owner
State
State Highway Agency

About this bridge

STOCKTON-S99 Onrmp over Union House Creek is a concrete continuous culvert carrying STOCKTON-S99 Onrmp over Union House Creek in Sacramento County, California. It was built in 1961, so it is 64 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 5,900 vehicles a day, roughly 2% of them trucks, projected to reach 12,458 by 2042. The structure is 29 ft (8.8 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSTOCKTON-S99 Onrmp
CrossesUnion House Creek
Location03-SAC-099-17.32-SAC
RouteState Highway 99
CountySacramento County
StateCalifornia
Coordinates38.47087, -121.41775
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadUnknown
Structure length29 ft (8.8 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,900 (2019)
Projected traffic12,458 by 2042
Trucks2%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
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 STOCKTON-S99 Onrmp over Union House Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is STOCKTON-S99 Onrmp over Union House 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 2024.

How much traffic does STOCKTON-S99 Onrmp over Union House Creek carry?

About 5,900 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is STOCKTON-S99 Onrmp over Union House Creek?

The structure is 29 ft (8.8 m) long with a longest span of 8 ft (2.4 m).

Who owns STOCKTON-S99 Onrmp over Union House Creek?

It is owned by the State Highway Agency.