US Bridges

Des Moines ST over Boone River

FairPosted for load

Hamilton County, Iowa · 000000000 · Structure no. 000000000012300

Built
1954
71 years old, rebuilt 2004
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
343 ft
3 main spans
Daily traffic
1,065
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Des Moines ST over Boone River is a steel continuous stringer/multi-beam or girder carrying Des Moines ST over Boone River in Hamilton County, Iowa. It was built in 1954 and reconstructed in 2004, so it is 71 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. Its operating status is: posted for load restriction.

It carries about 1,065 vehicles a day, projected to reach 1,065 by 2043. The structure is 343 ft (104.5 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesDes Moines ST
CrossesBoone River
Location000000000
RouteCity Street 0
CountyHamilton County
StateIowa
Coordinates42.47749, -93.82189
Functional classUrban Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating34.1 US tons
Inventory rating20.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length343 ft (104.5 m)
Longest span140 ft (42.7 m)
Deck width32 ft (9.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,065 (2022)
Projected traffic1,065 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Des Moines ST over Boone River built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 2004.

What condition is Des Moines ST 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 October 2023.

How much traffic does Des Moines ST over Boone River carry?

About 1,065 vehicles per day (2022 count).

How long is Des Moines ST over Boone River?

The structure is 343 ft (104.5 m) long with a longest span of 140 ft (42.7 m) and a deck 32 ft wide.

Who owns Des Moines ST over Boone River?

It is owned by the City or Municipal Highway Agency.