US Bridges

Bird Road over Delta-Mendota Canal

Poor

San Joaquin County, California · 0.2 MI N of S.H. 132 · Structure no. 29C0352

Built
1950
75 years old
Condition
Poor
inspected June 2024
Type
Tee Beam
Concrete Continuous
Length
108 ft
3 main spans
Daily traffic
471
2013 count
Owner
County
County Highway Agency

About this bridge

Bird Road over Delta-Mendota Canal is a concrete continuous tee beam carrying Bird Road over Delta-Mendota Canal in San Joaquin County, California. It was built in 1950, so it is 75 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 471 vehicles a day, roughly 10% of them trucks, projected to reach 612 by 2046. The structure is 108 ft (32.8 m) long and 25 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesBird Road
CrossesDelta-Mendota Canal
Location0.2 MI N of S.H. 132
RouteCounty Highway 0
Coordinates37.64131, -121.36116
Functional classRural Minor Collector

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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating21.4 US tons
Inventory rating16.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length108 ft (32.8 m)
Longest span40 ft (12.1 m)
Deck width25 ft (7.5 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic471 (2013)
Projected traffic612 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$946,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Bird Road over Delta-Mendota Canal built?

It was built in 1950, making it 75 years old in 2025.

What condition is Bird Road over Delta-Mendota Canal 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 June 2024.

How much traffic does Bird Road over Delta-Mendota Canal carry?

About 471 vehicles per day (2013 count), of which roughly 10% are trucks.

How long is Bird Road over Delta-Mendota Canal?

The structure is 108 ft (32.8 m) long with a longest span of 40 ft (12.1 m) and a deck 25 ft wide.

Who owns Bird Road over Delta-Mendota Canal?

It is owned by the County Highway Agency.