US Bridges

Dorchesterdr over Drainage Ditch

Fair

Allamakee County, Iowa · 100062409 · Structure no. 000000000013720

Built
1954
71 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
36 ft
2 main spans
Daily traffic
137
2022 count
Owner
County
County Highway Agency

About this bridge

Dorchesterdr over Drainage Ditch is a concrete continuous culvert carrying Dorchesterdr over Drainage Ditch in Allamakee County, Iowa. It was built in 1954, so it is 71 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 137 vehicles a day, roughly 9% of them trucks, projected to reach 137 by 2044. The structure is 36 ft (11 m) long. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesDorchesterdr
CrossesDrainage Ditch
Location100062409
RouteCounty Highway 0
CountyAllamakee County
StateIowa
Coordinates43.47029, -91.50438
Functional classRural Local

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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating25.6 US tons
Inventory rating18.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length36 ft (11 m)
Longest span23 ft (7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic137 (2022)
Projected traffic137 by 2044
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Dorchesterdr over Drainage Ditch built?

It was built in 1954, making it 71 years old in 2025.

What condition is Dorchesterdr over Drainage Ditch 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 April 2024.

How much traffic does Dorchesterdr over Drainage Ditch carry?

About 137 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Dorchesterdr over Drainage Ditch?

The structure is 36 ft (11 m) long with a longest span of 23 ft (7 m).

Who owns Dorchesterdr over Drainage Ditch?

It is owned by the County Highway Agency.