US Bridges

X99 Des Moines Ave over Flint Creek

Good

Des Moines County, Iowa · 070022908 · Structure no. 000000000023521

Built
2021
4 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
332 ft
3 main spans
Daily traffic
3,260
2022 count
Owner
County
County Highway Agency

About this bridge

X99 Des Moines Ave over Flint Creek is a prestressed concrete stringer/multi-beam or girder carrying X99 Des Moines Ave over Flint Creek in Des Moines County, Iowa. It was built in 2021, so it is 4 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 3,260 vehicles a day, roughly 14% of them trucks, projected to reach 3,260 by 2043. The structure is 332 ft (101.2 m) long and 43 ft wide. If it were closed, the detour would be 36 mi (58 km).

Location

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CarriesX99 Des Moines Ave
CrossesFlint Creek
Location070022908
RouteCity Street 0
CountyDes Moines County
StateIowa
Coordinates40.83614, -91.10948
Functional classUrban Minor Arterial

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 inspectionSeptember 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length332 ft (101.2 m)
Longest span152 ft (46.3 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,260 (2022)
Projected traffic3,260 by 2043
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed36 mi (58 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was X99 Des Moines Ave over Flint Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is X99 Des Moines Ave over Flint 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 September 2023.

How much traffic does X99 Des Moines Ave over Flint Creek carry?

About 3,260 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is X99 Des Moines Ave over Flint Creek?

The structure is 332 ft (101.2 m) long with a longest span of 152 ft (46.3 m) and a deck 43 ft wide.

Who owns X99 Des Moines Ave over Flint Creek?

It is owned by the County Highway Agency.