US Bridges

Irwin ST over Storm Drainage

Fair

Cochise County, Arizona · NW Hatfield Prosser Vil · Structure no. DAPTRAHUA063899

Built
1991
34 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
1,000
2023 count
Owner
Federal
Army

About this bridge

Irwin ST over Storm Drainage is a concrete culvert carrying Irwin ST over Storm Drainage in Cochise County, Arizona. It was built in 1991, so it is 34 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 1,000 vehicles a day, roughly 10% of them trucks, projected to reach 1,000 by 2044. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesIrwin ST
CrossesStorm Drainage
LocationNW Hatfield Prosser Vil
CountyCochise County
StateArizona
Coordinates31.56208, -110.3391
Functional classUrban Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.1 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2023)
Projected traffic1,000 by 2044
Trucks10%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRelief for waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerArmy
Maintained byArmy
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$25,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Irwin ST over Storm Drainage built?

It was built in 1991, making it 34 years old in 2025.

What condition is Irwin ST over Storm Drainage 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 Irwin ST over Storm Drainage carry?

About 1,000 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Irwin ST over Storm Drainage?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns Irwin ST over Storm Drainage?

It is owned by the Army.