US Bridges

State Route 99 NB over UP RR

Fair

Stanislaus County, California · 10-STA-099-R3.18-TUR · Structure no. 38 0128R

Built
1973
52 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Concrete Continuous
Length
134 ft
3 main spans
Daily traffic
41,475
2023 count
Owner
State
State Highway Agency

About this bridge

State Route 99 NB over UP RR is a concrete continuous tee beam carrying State Route 99 NB over UP RR in Stanislaus County, California. It was built in 1973, so it is 52 years old, younger 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 5 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 41,475 vehicles a day, roughly 17% of them trucks, projected to reach 92,995 by 2045. The structure is 134 ft (40.8 m) long and 53 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesState Route 99 NB
CrossesUP RR
Location10-STA-099-R3.18-TUR
RouteState Highway 99
CountyStanislaus County
StateCalifornia
Coordinates37.48893, -120.86775
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.8 US tons
Inventory rating44 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length134 ft (40.8 m)
Longest span54 ft (16.6 m)
Deck width53 ft (16.2 m)
Roadway width51 ft (15.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,475 (2023)
Projected traffic92,995 by 2045
Trucks17%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 State Route 99 NB over UP RR built?

It was built in 1973, making it 52 years old in 2025.

What condition is State Route 99 NB over UP RR 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 March 2023.

How much traffic does State Route 99 NB over UP RR carry?

About 41,475 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is State Route 99 NB over UP RR?

The structure is 134 ft (40.8 m) long with a longest span of 54 ft (16.6 m) and a deck 53 ft wide.

Who owns State Route 99 NB over UP RR?

It is owned by the State Highway Agency.