US Bridges

M21 W Ave over Branch Maple River

Good

Cherokee County, Iowa · 092390202 · Structure no. 000000000108691

Built
2019
6 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
51 ft
1 main span
Daily traffic
190
2022 count
Owner
County
County Highway Agency

About this bridge

M21 W Ave over Branch Maple River is a concrete stringer/multi-beam or girder carrying M21 W Ave over Branch Maple River in Cherokee County, Iowa. It was built in 2019, so it is 6 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 190 vehicles a day, roughly 12% of them trucks, projected to reach 190 by 2043. The structure is 51 ft (15.5 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesM21 W Ave
CrossesBranch Maple River
Location092390202
RouteCounty Highway 0
CountyCherokee County
StateIowa
Coordinates42.81547, -95.42709
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length51 ft (15.5 m)
Longest span50 ft (15.2 m)
Deck width32 ft (9.7 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic190 (2022)
Projected traffic190 by 2043
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was M21 W Ave over Branch Maple River built?

It was built in 2019, making it 6 years old in 2025.

What condition is M21 W Ave over Branch Maple River 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 August 2023.

How much traffic does M21 W Ave over Branch Maple River carry?

About 190 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is M21 W Ave over Branch Maple River?

The structure is 51 ft (15.5 m) long with a longest span of 50 ft (15.2 m) and a deck 32 ft wide.

Who owns M21 W Ave over Branch Maple River?

It is owned by the County Highway Agency.