US Bridges

Ia 14 over N. Blackhawk Creek

Good

Grundy County, Iowa · 1.2 Miles S of Jct. US 20 · Structure no. 000000000025851

Built
2006
19 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete Continuous
Length
93 ft
3 main spans
Daily traffic
4,770
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 14 over N. Blackhawk Creek is a concrete continuous slab carrying Ia 14 over N. Blackhawk Creek in Grundy County, Iowa. It was built in 2006, so it is 19 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,770 vehicles a day, roughly 11% of them trucks, projected to reach 4,770 by 2044. The structure is 93 ft (28.3 m) long and 47 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesIa 14
CrossesN. Blackhawk Creek
Location1.2 Miles S of Jct. US 20
RouteState Highway 14
StateIowa
Coordinates42.44549, -92.76869
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86 US tons
Inventory rating51.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length93 ft (28.3 m)
Longest span35 ft (10.7 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,770 (2022)
Projected traffic4,770 by 2044
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ia 14 over N. Blackhawk Creek built?

It was built in 2006, making it 19 years old in 2025.

What condition is Ia 14 over N. Blackhawk Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does Ia 14 over N. Blackhawk Creek carry?

About 4,770 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is Ia 14 over N. Blackhawk Creek?

The structure is 93 ft (28.3 m) long with a longest span of 35 ft (10.7 m) and a deck 47 ft wide.

Who owns Ia 14 over N. Blackhawk Creek?

It is owned by the State Highway Agency.