US Bridges

S Grand Ave over Overflow Channel

Good

Story County, Iowa · 0.4 MI N of S 16th Street · Structure no. 000000000505505

Built
2021
4 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
267 ft
3 main spans
Daily traffic
4,085
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

S Grand Ave over Overflow Channel is a prestressed concrete stringer/multi-beam or girder carrying S Grand Ave over Overflow Channel in Story 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 4,085 vehicles a day, projected to reach 4,085 by 2043. The structure is 267 ft (81.4 m) long and 51 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesS Grand Ave
CrossesOverflow Channel
Location0.4 MI N of S 16th Street
RouteCity Street 0
CountyStory County
StateIowa
Coordinates42.01303, -93.62217
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 inspectionApril 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.3 US tons
Inventory rating45.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length267 ft (81.4 m)
Longest span102 ft (31.1 m)
Deck width51 ft (15.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,085 (2022)
Projected traffic4,085 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRelief for waterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byTown or Township 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 S Grand Ave over Overflow Channel built?

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

What condition is S Grand Ave over Overflow Channel 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 April 2024.

How much traffic does S Grand Ave over Overflow Channel carry?

About 4,085 vehicles per day (2022 count).

How long is S Grand Ave over Overflow Channel?

The structure is 267 ft (81.4 m) long with a longest span of 102 ft (31.1 m) and a deck 51 ft wide.

Who owns S Grand Ave over Overflow Channel?

It is owned by the City or Municipal Highway Agency and maintained by the Town or Township Highway Agency.