During the months of May through October, ORSANCO interrogates thirteen stations for dissolved oxygen (D.O.) and temperature data once per day, Monday through Friday, for the previous 24-hour period. This data is compiled in-house to produce a report showing the minimum, maximum and average of the acquired D.O. and temperature readings. ORSANCO has also deployed Hydrolabs at three locations: Newburgh, J.T. Myers, and Smithland. This daily data is used in place of the Corps of Engineers data. ORSANCO’s water quality criteria for the protection of warm water aquatic life habitat are:
- The minimum D.O. concentration shall not be less than 4.0 mg/L at any time.
- Average D.O. concentration shall be at least 5.0 mg/L for each calendar day.
- During the April 15 – June 15 spawning season, a minimum concentration of 5.0 mg/L shall be maintained at all times.