US Bridges

660th Ave over Rock Creek

GoodPosted for load

Story County, Iowa · 0.4 MI N of Ia 210 · Structure no. 000000000313821

Built
2016
9 years old
Condition
Good
inspected January 2023
Type
Slab
Concrete Continuous
Length
97 ft
3 main spans
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

660th Ave over Rock Creek is a concrete continuous slab carrying 660th Ave over Rock Creek in Story County, Iowa. It was built in 2016, so it is 9 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. Its operating status is: posted for other load-capacity restriction.

It carries about 100 vehicles a day, projected to reach 100 by 2043. The structure is 97 ft (29.6 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries660th Ave
CrossesRock Creek
Location0.4 MI N of Ia 210
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates41.89694, -93.38786
Functional classRural Local

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 inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.5 US tons
Inventory rating44.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length97 ft (29.6 m)
Longest span39 ft (11.9 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic100 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 660th Ave over Rock Creek built?

It was built in 2016, making it 9 years old in 2025.

What condition is 660th Ave over Rock 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 January 2023.

How much traffic does 660th Ave over Rock Creek carry?

About 100 vehicles per day (2022 count).

How long is 660th Ave over Rock Creek?

The structure is 97 ft (29.6 m) long with a longest span of 39 ft (11.9 m) and a deck 33 ft wide.

Who owns 660th Ave over Rock Creek?

It is owned by the County Highway Agency.