US Bridges

6th ST over Drainage

PoorClosed to traffic

Clayton County, Iowa · M18000800 · Structure no. 000000000008230

Built
1920
105 years old
Condition
Poor
inspected April 2010
Type
Slab
Concrete
Length
22 ft
1 main span
Daily traffic
242
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

6th ST over Drainage is a concrete slab carrying 6th ST over Drainage in Clayton County, Iowa. It was built in 1920, so it is 105 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 1 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: closed to all traffic.

It carries about 242 vehicles a day, projected to reach 242 by 2043. The structure is 22 ft (6.7 m) long and 26 ft wide.

Location

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Carries6th ST
CrossesDrainage
LocationM18000800
RouteCity Street 0
CountyClayton County
StateIowa
Coordinates43.01987, -91.18154
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure1 Imminent FailureMajor deterioration or section loss present in critical structural components. Bridge is closed to traffic but corrective action may put it back in light service.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2010
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry5: 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 rating13.9 US tons
Inventory rating6.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span22 ft (6.7 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic242 (2022)
Projected traffic242 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was 6th ST over Drainage built?

It was built in 1920, making it 105 years old in 2025.

What condition is 6th ST 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 April 2010.

How much traffic does 6th ST over Drainage carry?

About 242 vehicles per day (2022 count).

How long is 6th ST over Drainage?

The structure is 22 ft (6.7 m) long with a longest span of 22 ft (6.7 m) and a deck 26 ft wide.

Who owns 6th ST over Drainage?

It is owned by the City or Municipal Highway Agency.