Person working in a well

A New Age in Monitoring Iowa’s Aquifers

Wednesday, September 13, 2023
The IGS monitors groundwater levels in 48 wells scattered across Iowa that are completed in most of the major bedrock aquifers. These wells provide a historical record of groundwater levels and help evaluate aquifer sustainability.
Water measurement and sampling equipment

Assessing the Effectiveness of Modified Blind Inlets in Southeast Iowa

Thursday, August 17, 2023
Since 2019, the Iowa Geological Survey led by Matthew Streeter has been quantifying reductions in nitrate, phosphorus, and sediment concentrations at multiple sites in Keokuk, Scott, and Wapello counties in Iowa.
Ryan Clark and fellow volunteer Jeremy Davis with a full boat of trash

The Iowa Geological Survey and Iowa Project AWARE: A Match Made in Mud!

Wednesday, August 2, 2023
For the past 20 years Iowa Project AWARE (A Watershed Awareness River Expedition) has been cleaning up Iowa’s rivers with the help of hordes of volunteers and a few dedicated staff members. The Iowa Geological Survey (IGS) has participated just about every year, from helping haul trash to giving educational programs.
Iowa map

Groundwater Quantity Challenges for Iowa's Unconfined Aquifers

Wednesday, June 28, 2023
Iowa relies on groundwater, especially unconfined aquifers, for drinking water and agriculture. Climate change affects recharge and sustainability. Alluvial aquifers face risks from drought and demand. Strategies like floodplain features and better pumping management enhance sustainability.
des M

Timing of the Des Moines Lobe

Wednesday, June 7, 2023
Central Iowa was glaciated by the Des Moines Lobe, which advanced quickly and lacked features like drumlins, eskers, and kames. Scientists determine the timing of ice advance by radiocarbon dating organic materials in glacial sediment. The calibrated ages show that the Des Moines Lobe reached Des Moines around 15,700 to 16,000 years ago and advanced rapidly at a rate of 1-2 km per year.

Imaging Iowa’s Levees

Thursday, May 4, 2023
Iowa has approximately 700 miles of levees protecting towns, agricultural land, and other infrastructure. Assessing the condition of levees is a critical component to ensure they remain strong during flood events. The IGS recently established methods to use geophysics to image levees via a pilot investigation with the Iowa Department of Homeland Security and Emergency Management
Surficial map of Lee County, Iowa

Geologic mapping at the Iowa Geological Survey

Wednesday, March 1, 2023
Geologic maps have tremendous societal, economic, and educational value. Bedrock and surficial geologic maps may be used to assist in aggregate resource evaluations, flood protection, hazard identification (sinkholes and karst), and water resource assessments.
Cover of IGS geode magazine

Our latest issue of The IGS Geode

Friday, January 27, 2023
Please enjoy an online copy of our magazine, The IGS Geode, showcasing some of the Iowa Geological Survey’s activities during the past year.
Map of proposed Well Head Protection Area (WHPA)

Source Water Delineation for Communities

Friday, January 20, 2023
For better and more accurate source water delineations, IGS is available to assist communities with their well head protection planning, especially in the crucial delineation of the well head protection area.
Map showing USDM drought classifications for Iowa, as of Dec 8, 2022.

Drought Regions of Iowa

Wednesday, December 14, 2022
The Iowa Geological Survey (IGS) has significantly assisted in creating the drought plan by providing scientific expertise on the state’s regional characteristics and available hydrologic data.