US Bridges

Ia 17 over US 30

Fair

Boone County, Iowa · At Junction With US 30 · Structure no. 000000000015340

Built
1968
57 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
279 ft
4 main spans
Daily traffic
4,960
2023 count
Owner
State
State Highway Agency

About this bridge

Ia 17 over US 30 is a prestressed concrete stringer/multi-beam or girder carrying Ia 17 over US 30 in Boone County, Iowa. It was built in 1968, so it is 57 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 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 4,960 vehicles a day, roughly 9% of them trucks, projected to reach 4,960 by 2043. The structure is 279 ft (85 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIa 17
CrossesUS 30
LocationAt Junction With US 30
RouteState Highway 17
CountyBoone County
StateIowa
Coordinates42.03438, -93.8154
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating74.4 US tons
Inventory rating30.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length279 ft (85 m)
Longest span82 ft (25 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,960 (2023)
Projected traffic4,960 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ia 17 over US 30 built?

It was built in 1968, making it 57 years old in 2025.

What condition is Ia 17 over US 30 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 March 2024.

How much traffic does Ia 17 over US 30 carry?

About 4,960 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Ia 17 over US 30?

The structure is 279 ft (85 m) long with a longest span of 82 ft (25 m) and a deck 47 ft wide.

Who owns Ia 17 over US 30?

It is owned by the State Highway Agency.