US Bridges

State Route 99 NB over Tuolumne Blvd

Poor

Stanislaus County, California · 10-STA-099-R15.10 · Structure no. 38 0096R

Built
1963
62 years old
Condition
Poor
inspected March 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
160 ft
2 main spans
Daily traffic
52,500
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 99 NB over Tuolumne Blvd is a concrete continuous box beam or girders - multiple carrying State Route 99 NB over Tuolumne Blvd in Stanislaus County, California. It was built in 1963, so it is 62 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 52,500 vehicles a day, roughly 12% of them trucks, projected to reach 65,480 by 2041. The structure is 160 ft (48.8 m) long and 56 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesState Route 99 NB
CrossesTuolumne Blvd
Location10-STA-099-R15.10
RouteState Highway 99
CountyStanislaus County
StateCalifornia
Coordinates37.62725, -120.99658
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.
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.5 US tons
Inventory rating44.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length160 ft (48.8 m)
Longest span79 ft (24.1 m)
Deck width56 ft (17 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic52,500 (2009)
Projected traffic65,480 by 2041
Trucks12%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.5 million (2020 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 99 NB over Tuolumne Blvd built?

It was built in 1963, making it 62 years old in 2025.

What condition is State Route 99 NB over Tuolumne Blvd 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 March 2023.

How much traffic does State Route 99 NB over Tuolumne Blvd carry?

About 52,500 vehicles per day (2009 count), of which roughly 12% are trucks.

How long is State Route 99 NB over Tuolumne Blvd?

The structure is 160 ft (48.8 m) long with a longest span of 79 ft (24.1 m) and a deck 56 ft wide.

Who owns State Route 99 NB over Tuolumne Blvd?

It is owned by the State Highway Agency.