US Bridges

U.S. Highway 6 over Lower Mcnally Canal

Fair

Inyo County, California · 09-INY-006-6.46-BIS · Structure no. 48 0038

Built
1949
76 years old, rebuilt 1987
Condition
Fair
inspected September 2024
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
4,550
2017 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 6 over Lower Mcnally Canal is a concrete slab carrying U.S. Highway 6 over Lower Mcnally Canal in Inyo County, California. It was built in 1949 and reconstructed in 1987, so it is 76 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 4,550 vehicles a day, roughly 20% of them trucks, projected to reach 5,470 by 2041. The structure is 23 ft (7 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesU.S. Highway 6
CrossesLower Mcnally Canal
Location09-INY-006-6.46-BIS
RouteU.S. Route 6
Coordinates37.43537, -118.34958
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating28.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length23 ft (7 m)
Longest span20 ft (6.1 m)
Deck width43 ft (13.2 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,550 (2017)
Projected traffic5,470 by 2041
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was U.S. Highway 6 over Lower Mcnally Canal built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 1987.

What condition is U.S. Highway 6 over Lower Mcnally 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 September 2024.

How much traffic does U.S. Highway 6 over Lower Mcnally Canal carry?

About 4,550 vehicles per day (2017 count), of which roughly 20% are trucks.

How long is U.S. Highway 6 over Lower Mcnally Canal?

The structure is 23 ft (7 m) long with a longest span of 20 ft (6.1 m) and a deck 43 ft wide.

Who owns U.S. Highway 6 over Lower Mcnally Canal?

It is owned by the State Highway Agency.