US Bridges

Avenue 21 over Eastside Bypass Channel

Fair

Madera County, California · 1.25 MI W of RD 4 · Structure no. 41C0091

Built
1963
62 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete Continuous
Length
539 ft
21 main spans
Daily traffic
94
1979 count
Owner
County
County Highway Agency

About this bridge

Avenue 21 over Eastside Bypass Channel is a concrete continuous slab carrying Avenue 21 over Eastside Bypass Channel in Madera 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 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 94 vehicles a day, roughly 12% of them trucks, projected to reach 163 by 2041. The structure is 539 ft (164.3 m) long and 31 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesAvenue 21
CrossesEastside Bypass Channel
Location1.25 MI W of RD 4
RouteCounty Highway 0
CountyMadera County
StateCalifornia
Coordinates37.05455, -120.49975
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating65.4 US tons
Inventory rating39.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans21
Design loadHS 20
Structure length539 ft (164.3 m)
Longest span26 ft (7.9 m)
Deck width31 ft (9.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic94 (1979)
Projected traffic163 by 2041
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Avenue 21 over Eastside Bypass Channel built?

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

What condition is Avenue 21 over Eastside Bypass Channel 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 Avenue 21 over Eastside Bypass Channel carry?

About 94 vehicles per day (1979 count), of which roughly 12% are trucks.

How long is Avenue 21 over Eastside Bypass Channel?

The structure is 539 ft (164.3 m) long with a longest span of 26 ft (7.9 m) and a deck 31 ft wide.

Who owns Avenue 21 over Eastside Bypass Channel?

It is owned by the County Highway Agency.