Briggs Woods

Three dedicated groundwater monitoring wells were drilled at Briggs Woods Park near Webster City in Hamilton County. Briggs Woods 1 is 35 feet deep and is monitoring the water table in the Quaternary till above the bedrock aquifer. The next deepest well (Briggs Woods 2) is 110 feet deep and allows us to monitor an upper aquifer zone (St. Louis-Pella Formations) in the Mississippian aquifer. Briggs Woods 3 is 410 feet deep and taps water from the lower portion of the Mississippian aged Maynes Creek Formation.

Core descriptions (Quaternary and Bedrock) and stratigraphic section have been prepared for each well.

Pump tests were performed on all three wells to determine the water level response when the wells were pumped. During the well drilling, isolated intervals were selected for water quality analysis. These intervals were isolated using a packer (an inflatable device) and then water samples were taken.

Water quality analyses were performed on the two deep wells in July 2002 and April 2003 (click here for analysis results). At these times, the shallow well was not producing enough water for sampling. These wells will continue to be sampled to monitor the water quality in these aquifers.

Water level data   (feet below ground surface)

Photos (click to enlarge)

  Drill rig

Close-up of rig

Core