US Bridges

Mill Cr. Expwy. over Harts Mill Creek

Fair

Clinton County, Iowa · 081061505 · Structure no. 000000000504535

Built
2000
25 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete Continuous
Length
153 ft
3 main spans
Daily traffic
8,400
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mill Cr. Expwy. over Harts Mill Creek is a concrete continuous slab carrying Mill Cr. Expwy. over Harts Mill Creek in Clinton 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 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 8,400 vehicles a day, roughly 7% of them trucks, projected to reach 8,400 by 2044. The structure is 153 ft (46.6 m) long and 43 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMill Cr. Expwy.
CrossesHarts Mill Creek
Location081061505
RouteCity Street 0
CountyClinton County
StateIowa
Coordinates41.82473, -90.25541
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.3 US tons
Inventory rating36.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length153 ft (46.6 m)
Longest span59 ft (18 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,400 (2022)
Projected traffic8,400 by 2044
Trucks7%
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mill Cr. Expwy. over Harts Mill Creek built?

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

What condition is Mill Cr. Expwy. 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 Mill Cr. Expwy. over Harts Mill Creek carry?

About 8,400 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is Mill Cr. Expwy. over Harts Mill Creek?

The structure is 153 ft (46.6 m) long with a longest span of 59 ft (18 m) and a deck 43 ft wide.

Who owns Mill Cr. Expwy. over Harts Mill Creek?

It is owned by the City or Municipal Highway Agency.