Group Offers Reward In Salt Creek Fish Kill Case Sheriff's Offer To Help Apparently Turned Down POSTED: 3:47 pm CDT July 14, 2006 UPDATED: 5:19 pm CDT July 14, 2006 LINCOLN, Neb. -- A reward of up to $1,000 has been offered to help find out who killed thousands of fish in Salt Creek. A group called Friends of Wilderness Park made the offer. Mary Roseberry-Brown, the group president, said the reward is for the identification and conviction of whoever was responsible. Thousands of fish died last weekend along a 10-mile section from Roca to Lincoln, including Wilderness Park. The state thinks someone illegally dumped ammonia into the creek, and investigators are awaiting test results on water samples. It is the third time in five years investigators said someone has dumped illegally into the creek. A Department of Environmental Quality spokesman said investigators have ruled out contamination from livestock waste and from an ammonia pipeline that runs through the Roca area. Friends of Wilderness Park 's Foster Collins said he's frustrated that law enforcement is not being included in the investigation. "I don't know at this point what is being done. If it was an intentional dumping, then that is a criminal matter and that's something the sheriffs office would be better equipped to investigate than DEQ," Collins said. A representative of the Lancaster County Sheriff's Office said the department offered to help, but was turned down. DEQ said it typically works with the Nebraska Game and Parks Commission on these type of investigations.