Basements in Carter Lake, Iowa
Carter Lake is one of the rare places where the Iowa-Nebraska line leaves the Missouri River. On July 8, 1877, the river broke through the neck of Saratoga Bend, leaving the old channel as "Cut-Off Lake," now Carter Lake.1,2
River-bottom ground
Because the town sits on old river bottom, groundwater and seepage at the floor-wall joint are common concerns. During the 2011 Missouri River flood, the river stayed above the 100-year flood elevation for about 90 days, and Iowa's state task force described a summer of more than 100 days of flooding.3,4 Long high-water periods can raise groundwater around river-bottom homes even when levees hold. Whether a particular home was affected in 2011 varies, so don't assume either way.
Permits are local
Carter Lake is its own city, separate from Council Bluffs. Ask the City of Carter Lake about any permits needed for structural or drainage work.
Check your flood zone
Use the FEMA Flood Map Service Center for your exact address.5
Sources
- History Nebraska – Training the Missouri River at Omaha, 1877–1883
- Council Bluffs Public Library – Bi-State Battle for Carter Lake and Lake Manawa
- USACE – Programmatic Environmental Assessment, Council Bluffs Levee Program
- Iowa HSEMD – Missouri River Flood Coordination Task Force Report (2011)
- FEMA Flood Map Service Center (look up your address)
Sources checked October 2026. Local conditions vary lot by lot; this page is general information, not an engineering assessment.