US Bridges

N Blackstone Ave over Herndon Canal

Good

Fresno County, California · At Shields Ave · Structure no. 42C0589

Built
1941
84 years old, rebuilt 2003
Condition
Good
inspected December 2022
Type
Slab
Concrete Continuous
Length
57 ft
2 main spans
Daily traffic
28,100
2010 count
Owner
City
City or Municipal Highway Agency

About this bridge

N Blackstone Ave over Herndon Canal is a concrete continuous slab carrying N Blackstone Ave over Herndon Canal in Fresno County, California. It was built in 1941 and reconstructed in 2003, so it is 84 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 28,100 vehicles a day, roughly 2% of them trucks, projected to reach 66,079 by 2044. The structure is 57 ft (17.5 m) long and 145 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesN Blackstone Ave
CrossesHerndon Canal
LocationAt Shields Ave
RouteCity Street 0
CountyFresno County
StateCalifornia
Coordinates36.77942, -119.79033
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.1 US tons
Inventory rating40.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length57 ft (17.5 m)
Longest span24 ft (7.2 m)
Deck width145 ft (44.2 m)
Roadway width132 ft (40.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,100 (2010)
Projected traffic66,079 by 2044
Trucks2%
Lanes on structure9
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 N Blackstone Ave over Herndon Canal built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 2003.

What condition is N Blackstone Ave over Herndon Canal in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2022.

How much traffic does N Blackstone Ave over Herndon Canal carry?

About 28,100 vehicles per day (2010 count), of which roughly 2% are trucks.

How long is N Blackstone Ave over Herndon Canal?

The structure is 57 ft (17.5 m) long with a longest span of 24 ft (7.2 m) and a deck 145 ft wide.

Who owns N Blackstone Ave over Herndon Canal?

It is owned by the City or Municipal Highway Agency.