National Dam Safety Program. Welton Ideker Dam (MO 11010), Missouri - Nemaha - Nodaway Basin, Holt County, Missouri. Phase I Inspection Report.

Welton Ideker Dam was inspected by an interdisciplinary team of engineers. The purpose of the inspection was to make an assessment of the general condition of the dam with respect to safety, based upon available data and visual inspection, in order to determine if the dam poses hazards to human life or property. Our inspection and evaluation indicates that the spillway does not meet the criteria set forth in the recommended guidelines for a small dam having a high hazard potential. Considering the small volume of water impounded, the nature of the downstream channel and the hazards involved, one-half of the Probable Maximum Flood is the appropriate spillway design flood. The spillway will not pass the 100-year flood (flood having a one percent chance of being exceeded in any year) without overtopping the dam. The spillway will pass 9% of the Probable Maximum Flood as well as the 10-year flood without overtopping the dam. The Probable Maximum Flood (PMF) is defined as the flood that may be expected from the most severe combination of critical meteorologic and hydrologic conditions that are reasonably possible in the region.