US Bridges

S Clark ST over Blackhawk Creek

Poor

Scott County, Iowa · 000000000 · Structure no. 000000000003220

Built
1950
75 years old, rebuilt 1983
Condition
Poor
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
47 ft
1 main span
Daily traffic
4,004
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

S Clark ST over Blackhawk Creek is a steel stringer/multi-beam or girder carrying S Clark ST over Blackhawk Creek in Scott County, Iowa. It was built in 1950 and reconstructed in 1983, so it is 75 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.

It carries about 4,004 vehicles a day, projected to reach 4,004 by 2043. The structure is 47 ft (14.3 m) long and 39 ft wide.

Location

Open in Google Maps
CarriesS Clark ST
CrossesBlackhawk Creek
Location000000000
RouteCity Street 0
CountyScott County
StateIowa
Coordinates41.51672, -90.62198
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 alignment6: Equal to present minimum criteria
Operating rating48.8 US tons
Inventory rating21.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length47 ft (14.3 m)
Longest span43 ft (13.1 m)
Deck width39 ft (11.9 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,004 (2022)
Projected traffic4,004 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 proposedNone recorded
Estimated improvement cost$90,000
NavigationNo navigation control on waterway

Frequently asked questions

When was S Clark ST over Blackhawk Creek built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1983.

What condition is S Clark ST over Blackhawk Creek 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 June 2023.

How much traffic does S Clark ST over Blackhawk Creek carry?

About 4,004 vehicles per day (2022 count).

How long is S Clark ST over Blackhawk Creek?

The structure is 47 ft (14.3 m) long with a longest span of 43 ft (13.1 m) and a deck 39 ft wide.

Who owns S Clark ST over Blackhawk Creek?

It is owned by the City or Municipal Highway Agency.