US Bridges

Hart Mill RD over Harts Mill Creek

Fair

Clinton County, Iowa · 081061101 · Structure no. 000000000002091

Built
1988
37 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
113 ft
3 main spans
Daily traffic
102
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Hart Mill RD over Harts Mill Creek is a prestressed concrete stringer/multi-beam or girder carrying Hart Mill RD over Harts Mill Creek in Clinton County, Iowa. It was built in 1988, so it is 37 years old, younger 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 6 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 102 vehicles a day, projected to reach 102 by 2044. The structure is 113 ft (34.4 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesHart Mill RD
CrossesHarts Mill Creek
Location081061101
RouteCity Street 0
CountyClinton County
StateIowa
Coordinates41.82801, -90.26371
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating70.4 US tons
Inventory rating42.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length113 ft (34.4 m)
Longest span44 ft (13.4 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic102 (2022)
Projected traffic102 by 2044
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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$17,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Hart Mill RD over Harts Mill Creek built?

It was built in 1988, making it 37 years old in 2025.

What condition is Hart Mill RD over Harts Mill Creek 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 May 2024.

How much traffic does Hart Mill RD over Harts Mill Creek carry?

About 102 vehicles per day (2022 count).

How long is Hart Mill RD over Harts Mill Creek?

The structure is 113 ft (34.4 m) long with a longest span of 44 ft (13.4 m) and a deck 33 ft wide.

Who owns Hart Mill RD over Harts Mill Creek?

It is owned by the City or Municipal Highway Agency.