US Bridges

Local - 670th over Seven Mile Creek

Fair

Cass County, Iowa · 075353202 · Structure no. 000000000098401

Built
1978
47 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
165 ft
3 main spans
Daily traffic
15
2022 count
Owner
County
County Highway Agency

About this bridge

Local - 670th over Seven Mile Creek is a prestressed concrete stringer/multi-beam or girder carrying Local - 670th over Seven Mile Creek in Cass County, Iowa. It was built in 1978, so it is 47 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 15 vehicles a day, projected to reach 15 by 2044. The structure is 165 ft (50.3 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesLocal - 670th
CrossesSeven Mile Creek
Location075353202
RouteCounty Highway 0
CountyCass County
StateIowa
Coordinates41.2518, -94.91087
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating47.8 US tons
Inventory rating27.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length165 ft (50.3 m)
Longest span69 ft (21 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2022)
Projected traffic15 by 2044
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Local - 670th over Seven Mile Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Local - 670th over Seven Mile Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in February 2024.

How much traffic does Local - 670th over Seven Mile Creek carry?

About 15 vehicles per day (2022 count).

How long is Local - 670th over Seven Mile Creek?

The structure is 165 ft (50.3 m) long with a longest span of 69 ft (21 m) and a deck 30 ft wide.

Who owns Local - 670th over Seven Mile Creek?

It is owned by the County Highway Agency.