US Bridges

Herber RD over Drainage Ditch

Good

Dubuque County, Iowa · R1ET89N35 · Structure no. 000000000366165

Built
2015
10 years old
Condition
Good
inspected April 2023
Type
Culvert
Concrete
Length
31 ft
3 main spans
Daily traffic
1,910
2023 count
Owner
County
County Highway Agency

About this bridge

Herber RD over Drainage Ditch is a concrete culvert carrying Herber RD over Drainage Ditch in Dubuque County, Iowa. It was built in 2015, so it is 10 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 1,910 vehicles a day, projected to reach 1,910 by 2043. The structure is 31 ft (9.6 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesHerber RD
CrossesDrainage Ditch
LocationR1ET89N35
RouteCounty Highway 0
CountyDubuque County
StateIowa
Coordinates42.57188, -90.69854
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 protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionApril 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 rating46.7 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHL 93
Structure length31 ft (9.6 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 traffic1,910 (2023)
Projected traffic1,910 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Herber RD over Drainage Ditch built?

It was built in 2015, making it 10 years old in 2025.

What condition is Herber RD over Drainage Ditch 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 April 2023.

How much traffic does Herber RD over Drainage Ditch carry?

About 1,910 vehicles per day (2023 count).

How long is Herber RD over Drainage Ditch?

The structure is 31 ft (9.6 m) long with a longest span of 10 ft (3 m).

Who owns Herber RD over Drainage Ditch?

It is owned by the County Highway Agency.