US Bridges

Dorchesterdr over Small Natural Stream

Fair

Allamakee County, Iowa · 100062411 · Structure no. 000000000013710

Built
1954
71 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
27 ft
2 main spans
Daily traffic
344
2022 count
Owner
County
County Highway Agency

About this bridge

Dorchesterdr over Small Natural Stream is a concrete continuous culvert carrying Dorchesterdr over Small Natural Stream 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 344 vehicles a day, projected to reach 344 by 2044. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesDorchesterdr
CrossesSmall Natural Stream
Location100062411
RouteCounty Highway 0
CountyAllamakee County
StateIowa
Coordinates43.46333, -91.49696
Functional classRural Major Collector

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating25.6 US tons
Inventory rating18.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length27 ft (8.2 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic344 (2022)
Projected traffic344 by 2044
Trucks0%
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 Small Natural Stream built?

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

What condition is Dorchesterdr over Small Natural Stream 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 Small Natural Stream carry?

About 344 vehicles per day (2022 count).

How long is Dorchesterdr over Small Natural Stream?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.7 m).

Who owns Dorchesterdr over Small Natural Stream?

It is owned by the County Highway Agency.