US Bridges

Mahogany Ave over Drainage

Good

Jefferson County, Iowa · 072090604 · Structure no. 000000000201131

Built
2017
8 years old
Condition
Good
inspected February 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
70
2022 count
Owner
County
County Highway Agency

About this bridge

Mahogany Ave over Drainage is a concrete continuous culvert carrying Mahogany Ave over Drainage in Jefferson County, Iowa. It was built in 2017, so it is 8 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 70 vehicles a day, projected to reach 70 by 2043. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMahogany Ave
CrossesDrainage
Location072090604
RouteCounty Highway 0
CountyJefferson County
StateIowa
Coordinates41.06292, -91.94884
Functional classRural Minor Collector

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.
Culvert8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.6 US tons
Inventory rating37.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHL 93
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 traffic70 (2022)
Projected traffic70 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mahogany Ave over Drainage built?

It was built in 2017, making it 8 years old in 2025.

What condition is Mahogany Ave 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 February 2023.

How much traffic does Mahogany Ave over Drainage carry?

About 70 vehicles per day (2022 count).

How long is Mahogany Ave over Drainage?

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

Who owns Mahogany Ave over Drainage?

It is owned by the County Highway Agency.