US Bridges

Inwood over Dredge Ditch

Good

Calhoun County, Iowa · 088331902 · Structure no. 000000000092161

Built
2000
25 years old
Condition
Good
inspected July 2023
Type
Slab
Concrete Continuous
Length
78 ft
3 main spans
Daily traffic
15
2022 count
Owner
County
County Highway Agency

About this bridge

Inwood over Dredge Ditch is a concrete continuous slab carrying Inwood over Dredge Ditch in Calhoun County, Iowa. It was built in 2000, so it is 25 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 15 vehicles a day, projected to reach 15 by 2043. The structure is 78 ft (23.8 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesInwood
CrossesDredge Ditch
Location088331902
RouteCounty Highway 0
CountyCalhoun County
StateIowa
Coordinates42.4164, -94.74682
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.1 US tons
Inventory rating50.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length78 ft (23.8 m)
Longest span29 ft (8.8 m)
Deck width31 ft (9.6 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2022)
Projected traffic15 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$30,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Inwood over Dredge Ditch built?

It was built in 2000, making it 25 years old in 2025.

What condition is Inwood over Dredge 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 July 2023.

How much traffic does Inwood over Dredge Ditch carry?

About 15 vehicles per day (2022 count).

How long is Inwood over Dredge Ditch?

The structure is 78 ft (23.8 m) long with a longest span of 29 ft (8.8 m) and a deck 31 ft wide.

Who owns Inwood over Dredge Ditch?

It is owned by the County Highway Agency.