US Bridges

Alexandra Drive over Drainage

Good

Black Hawk County, Iowa · City Culvert No. 56C · Structure no. 000000000504365

Built
1996
29 years old
Condition
Good
inspected June 2023
Type
Culvert
Concrete Continuous
Length
44 ft
4 main spans
Daily traffic
2,520
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Alexandra Drive over Drainage is a concrete continuous culvert carrying Alexandra Drive over Drainage in Black Hawk County, Iowa. It was built in 1996, so it is 29 years old, younger than the Iowa average of 45.5 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 2,520 vehicles a day, projected to reach 2,520 by 2043. The structure is 44 ft (13.4 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesAlexandra Drive
CrossesDrainage
LocationCity Culvert No. 56C
RouteCity Street 0
CountyBlack Hawk County
StateIowa
Coordinates42.45776, -92.33286
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.2 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadHS 20
Structure length44 ft (13.4 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 traffic2,520 (2022)
Projected traffic2,520 by 2043
Trucks0%
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 Alexandra Drive over Drainage built?

It was built in 1996, making it 29 years old in 2025.

What condition is Alexandra Drive over Drainage 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 June 2023.

How much traffic does Alexandra Drive over Drainage carry?

About 2,520 vehicles per day (2022 count).

How long is Alexandra Drive over Drainage?

The structure is 44 ft (13.4 m) long with a longest span of 10 ft (3 m).

Who owns Alexandra Drive over Drainage?

It is owned by the City or Municipal Highway Agency.