US Bridges

Research Loop over Drainageway

Good

Pima County, Arizona · 0.5 MI E Pantano RD · Structure no. 08919

Built
1985
40 years old
Condition
Good
inspected December 2023
Type
Culvert
Concrete Continuous
Length
43 ft
4 main spans
Daily traffic
200
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Research Loop over Drainageway is a concrete continuous culvert carrying Research Loop over Drainageway in Pima 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 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 200 vehicles a day, roughly 5% of them trucks, projected to reach 210 by 2042. The structure is 43 ft (13.1 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesResearch Loop
CrossesDrainageway
Location0.5 MI E Pantano RD
RouteCity Street 0
StateArizona
Coordinates32.20211, -110.82342
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating58 US tons
Inventory rating35.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span10 ft (3 m)
Deck width60 ft (18.2 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2022)
Projected traffic210 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 Research Loop over Drainageway built?

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

What condition is Research Loop over Drainageway 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 2023.

How much traffic does Research Loop over Drainageway carry?

About 200 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Research Loop over Drainageway?

The structure is 43 ft (13.1 m) long with a longest span of 10 ft (3 m) and a deck 60 ft wide.

Who owns Research Loop over Drainageway?

It is owned by the City or Municipal Highway Agency.