US Bridges

Tonapah Drive over Lake

Fair

Maricopa County, Arizona · 300 W JCT 51st Ave · Structure no. 08833

Built
1985
40 years old
Condition
Fair
inspected May 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
51 ft
1 main span
Daily traffic
360
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Tonapah Drive over Lake is a prestressed concrete box beam or girders - multiple carrying Tonapah Drive over Lake in Maricopa County, Arizona. It was built in 1985, so it is 40 years old, younger than the Arizona average of 47.8 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 360 vehicles a day, roughly 1% of them trucks, projected to reach 370 by 2042. The structure is 51 ft (15.5 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesTonapah Drive
CrossesLake
Location300 W JCT 51st Ave
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.67194, -112.17075
Functional classUrban 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 protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating93 US tons
Inventory rating55 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span47 ft (14.3 m)
Deck width56 ft (17.1 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic360 (2024)
Projected traffic370 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 Tonapah Drive over Lake built?

It was built in 1985, making it 40 years old in 2025.

What condition is Tonapah Drive over Lake 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 May 2024.

How much traffic does Tonapah Drive over Lake carry?

About 360 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is Tonapah Drive over Lake?

The structure is 51 ft (15.5 m) long with a longest span of 47 ft (14.3 m) and a deck 56 ft wide.

Who owns Tonapah Drive over Lake?

It is owned by the City or Municipal Highway Agency.