US Bridges

Z40 400th Ave over South Branch Elk River

Good

Clinton County, Iowa · 083E63006 · Structure no. 000000000125882

Built
2016
9 years old
Condition
Good
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
77 ft
2 main spans
Daily traffic
45
2022 count
Owner
County
County Highway Agency

About this bridge

Z40 400th Ave over South Branch Elk River is a steel stringer/multi-beam or girder carrying Z40 400th Ave over South Branch Elk River in Clinton 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 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 45 vehicles a day, projected to reach 45 by 2045. The structure is 77 ft (23.5 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesZ40 400th Ave
CrossesSouth Branch Elk River
Location083E63006
RouteCounty Highway 0
CountyClinton County
StateIowa
Coordinates41.96245, -90.31515
Functional classRural Minor 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 protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating107.1 US tons
Inventory rating97.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length77 ft (23.5 m)
Longest span48 ft (14.6 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2022)
Projected traffic45 by 2045
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Z40 400th Ave over South Branch Elk River built?

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

What condition is Z40 400th Ave over South Branch Elk 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 January 2025.

How much traffic does Z40 400th Ave over South Branch Elk River carry?

About 45 vehicles per day (2022 count).

How long is Z40 400th Ave over South Branch Elk River?

The structure is 77 ft (23.5 m) long with a longest span of 48 ft (14.6 m) and a deck 31 ft wide.

Who owns Z40 400th Ave over South Branch Elk River?

It is owned by the County Highway Agency.