US Bridges

NE 70th Ave over Muchinock Creek

Good

Polk County, Iowa · 079230401 · Structure no. 000000000281171

Built
2003
22 years old
Condition
Good
inspected March 2023
Type
Culvert
Concrete Continuous
Length
44 ft
3 main spans
Daily traffic
61
2023 count
Owner
County
County Highway Agency

About this bridge

NE 70th Ave over Muchinock Creek is a concrete continuous culvert carrying NE 70th Ave over Muchinock Creek in Polk County, Iowa. It was built in 2003, so it is 22 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 61 vehicles a day, roughly 5% of them trucks, projected to reach 61 by 2043. The structure is 44 ft (13.4 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNE 70th Ave
CrossesMuchinock Creek
Location079230401
RouteCounty Highway 0
CountyPolk County
StateIowa
Coordinates41.68838, -93.52537
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34 US tons
Inventory rating20.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic61 (2023)
Projected traffic61 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 NE 70th Ave over Muchinock Creek built?

It was built in 2003, making it 22 years old in 2025.

What condition is NE 70th Ave over Muchinock 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 March 2023.

How much traffic does NE 70th Ave over Muchinock Creek carry?

About 61 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is NE 70th Ave over Muchinock Creek?

The structure is 44 ft (13.4 m) long with a longest span of 12 ft (3.7 m).

Who owns NE 70th Ave over Muchinock Creek?

It is owned by the County Highway Agency.