US Bridges

740th ST over Seven Mile Creek

Good

Cass County, Iowa · 076343302 · Structure no. 000000000099132

Built
2015
10 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
71 ft
1 main span
Daily traffic
26
2022 count
Owner
County
County Highway Agency

About this bridge

740th ST over Seven Mile Creek is a steel stringer/multi-beam or girder carrying 740th ST over Seven Mile Creek in Cass County, Iowa. It was built in 2015, so it is 10 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 26 vehicles a day, roughly 19% of them trucks, projected to reach 26 by 2044. The structure is 71 ft (21.6 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries740th ST
CrossesSeven Mile Creek
Location076343302
RouteCounty Highway 0
StateIowa
Coordinates41.3448, -94.77702
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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
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
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating36.7 US tons
Inventory rating22 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length71 ft (21.6 m)
Longest span70 ft (21.3 m)
Deck width25 ft (7.6 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2022)
Projected traffic26 by 2044
Trucks19%
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 740th ST over Seven Mile Creek built?

It was built in 2015, making it 10 years old in 2025.

What condition is 740th ST over Seven Mile 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 February 2024.

How much traffic does 740th ST over Seven Mile Creek carry?

About 26 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is 740th ST over Seven Mile Creek?

The structure is 71 ft (21.6 m) long with a longest span of 70 ft (21.3 m) and a deck 25 ft wide.

Who owns 740th ST over Seven Mile Creek?

It is owned by the County Highway Agency.