US Bridges

Hilldale Avenue over Delta-Mendota Canal

Fair

Merced County, California · 1.6 MI N of SR 152 · Structure no. 39C0332

Built
1952
73 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
104 ft
4 main spans
Daily traffic
9
2008 count
Owner
County
County Highway Agency

About this bridge

Hilldale Avenue over Delta-Mendota Canal is a wood or timber stringer/multi-beam or girder carrying Hilldale Avenue over Delta-Mendota Canal in Merced County, California. It was built in 1952, so it is 73 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 9 vehicles a day, projected to reach 20 by 2045. The structure is 104 ft (31.7 m) long and 18 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesHilldale Avenue
CrossesDelta-Mendota Canal
Location1.6 MI N of SR 152
RouteCounty Highway 0
CountyMerced County
StateCalifornia
Coordinates37.08101, -120.99809
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating30.3 US tons
Inventory rating21.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadH 10
Structure length104 ft (31.7 m)
Longest span25 ft (7.6 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9 (2008)
Projected traffic20 by 2045
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Hilldale Avenue over Delta-Mendota Canal built?

It was built in 1952, making it 73 years old in 2025.

What condition is Hilldale Avenue over Delta-Mendota Canal 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 2025.

How much traffic does Hilldale Avenue over Delta-Mendota Canal carry?

About 9 vehicles per day (2008 count).

How long is Hilldale Avenue over Delta-Mendota Canal?

The structure is 104 ft (31.7 m) long with a longest span of 25 ft (7.6 m) and a deck 18 ft wide.

Who owns Hilldale Avenue over Delta-Mendota Canal?

It is owned by the County Highway Agency.