US Bridges

Rockinham RD over Blackhawk Creek

Fair

Scott County, Iowa · 000000000 · Structure no. 000000000002901

Built
1999
26 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
48 ft
1 main span
Daily traffic
9,480
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Rockinham RD over Blackhawk Creek is a concrete slab carrying Rockinham RD over Blackhawk Creek in Scott County, Iowa. It was built in 1999, so it is 26 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 9,480 vehicles a day, projected to reach 9,480 by 2043. The structure is 48 ft (14.6 m) long and 62 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesRockinham RD
CrossesBlackhawk Creek
Location000000000
RouteCity Street 0
CountyScott County
StateIowa
Coordinates41.50925, -90.62636
Functional classUrban Minor Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
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 geometry9: Superior to present desirable criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length48 ft (14.6 m)
Longest span48 ft (14.6 m)
Deck width62 ft (19 m)
Roadway width46 ft (13.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,480 (2022)
Projected traffic9,480 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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$6,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Rockinham RD over Blackhawk Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is Rockinham RD over Blackhawk 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 June 2023.

How much traffic does Rockinham RD over Blackhawk Creek carry?

About 9,480 vehicles per day (2022 count).

How long is Rockinham RD over Blackhawk Creek?

The structure is 48 ft (14.6 m) long with a longest span of 48 ft (14.6 m) and a deck 62 ft wide.

Who owns Rockinham RD over Blackhawk Creek?

It is owned by the City or Municipal Highway Agency.