M-2. Pool Creek. Sec. 25, T. 33 S, R. 10 E. May 26. Pool 120 feet by 40 feet below limestone ledge approximately 12 feet high forming Butcher's Falls. Other smaller pools sampled. Water clear. Bottom bedrock and rubble.
E-1. Elk River. Sec. 12, T. 31 S, R. 11 E. July 9. Four intermittent pools seined. Average width 32 feet, average depth 13 inches. Bottom bedrock, rubble, and mud. Water turbid.
E-2. Elk River. Sec. 3, T. 31 S, R. 11 E. June 28. Intermittent pools below and above sandstone ledge approximately 6 feet high forming "falls" at Elk Falls. Average width 33 feet, average depth 15 inches. Bottom bedrock, rubble and mud. Water slightly turbid.
E-3. Elk River. Sec. 21, T. 30 S, R. 11 E. June 28. Two small pools, 10 feet by 30 feet with average depth of 6 inches. Bottom bedrock.
E-4. Elk River. Sec. 12, T. 30 S, R. 10 E. June 28. One long pool 500 feet by 50 feet with a variety of depths and bottom conditions ranging from mud to bedrock. Average depth 18 inches. Water turbid and pools unshaded.
E-5. Elk River. Sec. 32, T. 29 S, R. 10 E. August 30. Intermittent pools. Average width 21 feet, average depth 20 inches. Bottom rubble. Water clear.
E-6. Elk River. Sec. 23, T. 29 S, R. 9 E. August 30. Small isolated pools. River mostly dry. Bottom bedrock. Water slightly turbid with gray-green "bloom."
E-7. Wildcat Creek. Sec. 11, T. 31 S, R. 10 E. Volume of flow less than one cfs. Average width 20 feet, average depth 18 inches. Domestic sewage pollution from town of Moline suspected.