US Bridges

CO Entrance over Drainage

PoorPosted for load

Madison County, Iowa · 00000 · Structure no. 000000000365735

Built
1972
53 years old
Condition
Poor
inspected August 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
30 ft
2 main spans
Daily traffic
11
2022 count
Owner
County
County Highway Agency

About this bridge

CO Entrance over Drainage is a wood or timber stringer/multi-beam or girder carrying CO Entrance over Drainage in Madison County, Iowa. It was built in 1972, so it is 53 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 11 vehicles a day, projected to reach 11 by 2043. The structure is 30 ft (9.1 m) long and 20 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCO Entrance
CrossesDrainage
Location00000
RouteCounty Highway 0
CountyMadison County
StateIowa
Coordinates41.28678, -93.91522
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating29.1 US tons
Inventory rating23.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span15 ft (4.6 m)
Deck width20 ft (6.2 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2022)
Projected traffic11 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$405,000 (2023 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was CO Entrance over Drainage built?

It was built in 1972, making it 53 years old in 2025.

What condition is CO Entrance over Drainage in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.

How much traffic does CO Entrance over Drainage carry?

About 11 vehicles per day (2022 count).

How long is CO Entrance over Drainage?

The structure is 30 ft (9.1 m) long with a longest span of 15 ft (4.6 m) and a deck 20 ft wide.

Who owns CO Entrance over Drainage?

It is owned by the County Highway Agency.