US Bridges

S70 Balsam Ave over Rock Creek

Good

Mitchell County, Iowa · Balsam and 390th · Structure no. 000000000248101

Built
2022
3 years old
Condition
Good
inspected December 2023
Type
Slab
Concrete
Length
70 ft
3 main spans
Daily traffic
354
2022 count
Owner
County
County Highway Agency

About this bridge

S70 Balsam Ave over Rock Creek is a concrete slab carrying S70 Balsam Ave over Rock Creek in Mitchell County, Iowa. It was built in 2022, so it is 3 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 354 vehicles a day, projected to reach 354 by 2043. The structure is 70 ft (21.3 m) long and 33 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesS70 Balsam Ave
CrossesRock Creek
LocationBalsam and 390th
RouteCounty Highway 0
CountyMitchell County
StateIowa
Coordinates43.3275, -93.00452
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation9: Superior to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating45.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length70 ft (21.3 m)
Longest span28 ft (8.5 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic354 (2022)
Projected traffic354 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 S70 Balsam Ave over Rock Creek built?

It was built in 2022, making it 3 years old in 2025.

What condition is S70 Balsam 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 December 2023.

How much traffic does S70 Balsam Ave over Rock Creek carry?

About 354 vehicles per day (2022 count).

How long is S70 Balsam Ave over Rock Creek?

The structure is 70 ft (21.3 m) long with a longest span of 28 ft (8.5 m) and a deck 33 ft wide.

Who owns S70 Balsam Ave over Rock Creek?

It is owned by the County Highway Agency.