US Bridges

Ia 17 over Montgomery Creek

Fair

Boone County, Iowa · 2.6 Miles S of JCT SR E18 · Structure no. 000000000015361

Built
1979
46 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
171 ft
3 main spans
Daily traffic
2,380
2023 count
Owner
State
State Highway Agency

About this bridge

Ia 17 over Montgomery Creek is a prestressed concrete stringer/multi-beam or girder carrying Ia 17 over Montgomery Creek in Boone County, Iowa. It was built in 1979, so it is 46 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 2,380 vehicles a day, roughly 11% of them trucks, projected to reach 2,380 by 2043. The structure is 171 ft (52.1 m) long and 47 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesIa 17
CrossesMontgomery Creek
Location2.6 Miles S of JCT SR E18
RouteState Highway 17
CountyBoone County
StateIowa
Coordinates42.12894, -93.79556
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating88.2 US tons
Inventory rating38.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length171 ft (52.1 m)
Longest span57 ft (17.4 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,380 (2023)
Projected traffic2,380 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Montgomery Creek built?

It was built in 1979, making it 46 years old in 2025.

What condition is Ia 17 over Montgomery 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 October 2024.

How much traffic does Ia 17 over Montgomery Creek carry?

About 2,380 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is Ia 17 over Montgomery Creek?

The structure is 171 ft (52.1 m) long with a longest span of 57 ft (17.4 m) and a deck 47 ft wide.

Who owns Ia 17 over Montgomery Creek?

It is owned by the State Highway Agency.