US Bridges

N Pilot Grove RD over Crane Creek

FairPosted for load

Black Hawk County, Iowa · 90-11-29-02-10 · Structure no. 000000000076130

Built
1948
77 years old
Condition
Fair
inspected November 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
183 ft
6 main spans
Daily traffic
59
2022 count
Owner
County
County Highway Agency

About this bridge

N Pilot Grove RD over Crane Creek is a steel stringer/multi-beam or girder carrying N Pilot Grove RD over Crane Creek in Black Hawk County, Iowa. It was built in 1948, so it is 77 years old, older 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. Its operating status is: posted for other load-capacity restriction.

It carries about 59 vehicles a day, projected to reach 59 by 2043. The structure is 183 ft (55.8 m) long and 19 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesN Pilot Grove RD
CrossesCrane Creek
Location90-11-29-02-10
RouteCounty Highway 0
CountyBlack Hawk County
StateIowa
Coordinates42.57644, -92.18053
Functional classRural 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2022
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating40 US tons
Inventory rating23.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadUnknown
Structure length183 ft (55.8 m)
Longest span30 ft (9.1 m)
Deck width19 ft (5.9 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic59 (2022)
Projected traffic59 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 N Pilot Grove RD over Crane Creek built?

It was built in 1948, making it 77 years old in 2025.

What condition is N Pilot Grove RD over Crane 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 November 2022.

How much traffic does N Pilot Grove RD over Crane Creek carry?

About 59 vehicles per day (2022 count).

How long is N Pilot Grove RD over Crane Creek?

The structure is 183 ft (55.8 m) long with a longest span of 30 ft (9.1 m) and a deck 19 ft wide.

Who owns N Pilot Grove RD over Crane Creek?

It is owned by the County Highway Agency.