US Bridges

Ia 17 over Boone River

Fair

Hamilton County, Iowa · 1.3 Miles S of JCT US 20 · Structure no. 000000000026455

Built
1972
53 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
326 ft
3 main spans
Daily traffic
3,460
2023 count
Owner
State
State Highway Agency

About this bridge

Ia 17 over Boone River is a steel continuous stringer/multi-beam or girder carrying Ia 17 over Boone River in Hamilton County, Iowa. It was built in 1972, so it is 53 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.

It carries about 3,460 vehicles a day, roughly 9% of them trucks, projected to reach 3,460 by 2043. The structure is 326 ft (99.4 m) long and 47 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIa 17
CrossesBoone River
Location1.3 Miles S of JCT US 20
RouteState Highway 17
CountyHamilton County
StateIowa
Coordinates42.4319, -93.80596
Functional classRural 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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating55.2 US tons
Inventory rating33.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length326 ft (99.4 m)
Longest span125 ft (38.1 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,460 (2023)
Projected traffic3,460 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 17 over Boone River built?

It was built in 1972, making it 53 years old in 2025.

What condition is Ia 17 over Boone River 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 January 2024.

How much traffic does Ia 17 over Boone River carry?

About 3,460 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Ia 17 over Boone River?

The structure is 326 ft (99.4 m) long with a longest span of 125 ft (38.1 m) and a deck 47 ft wide.

Who owns Ia 17 over Boone River?

It is owned by the State Highway Agency.