US Bridges

I-17 NB over Lone Mountain RD (L303)

Good

Maricopa County, Arizona · 2.0 MI S JCT SR 74 · Structure no. 02877

Built
2009
16 years old
Condition
Good
inspected January 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
201 ft
2 main spans
Daily traffic
54,661
2024 count
Owner
State
State Highway Agency

About this bridge

I-17 NB over Lone Mountain RD (L303) is a prestressed concrete continuous box beam or girders - single or spread carrying I-17 NB over Lone Mountain RD (L303) in Maricopa County, Arizona. It was built in 2009, so it is 16 years old, younger than the Arizona average of 47.8 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 54,661 vehicles a day, roughly 4% of them trucks, projected to reach 54,671 by 2042. The structure is 201 ft (61.3 m) long and 110 ft wide.

Location

Open in Google Maps
CarriesI-17 NB
CrossesLone Mountain RD (L303)
Location2.0 MI S JCT SR 74
RouteInterstate 17
CountyMaricopa County
StateArizona
Coordinates33.76894, -112.12904
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating52 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length201 ft (61.3 m)
Longest span98 ft (29.9 m)
Deck width110 ft (33.5 m)
Roadway width107 ft (32.6 m)
Vertical clearance over deck30 ft (9.1 m)

Traffic and service

Average daily traffic54,661 (2024)
Projected traffic54,671 by 2042
Trucks4%
Lanes on structure5
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-17 NB over Lone Mountain RD (L303) built?

It was built in 2009, making it 16 years old in 2025.

What condition is I-17 NB over Lone Mountain RD (L303) 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 January 2024.

How much traffic does I-17 NB over Lone Mountain RD (L303) carry?

About 54,661 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is I-17 NB over Lone Mountain RD (L303)?

The structure is 201 ft (61.3 m) long with a longest span of 98 ft (29.9 m) and a deck 110 ft wide.

Who owns I-17 NB over Lone Mountain RD (L303)?

It is owned by the State Highway Agency.