There was a river reversal this morning at the Wilmette Pumping Station. Approximately 2.71 inches of rain fell in a short amount of time late last night and early this morning at the North Branch Pumping Station, with the majority falling between 11 p.m. and 1:30 a.m. This rainfall is in addition to the recent wet weather events we have experienced over the last few weeks. The reversal occurred from 2:08 a.m. to 6 a.m. The date of the last reversal was October 14, 2017.


This storm overnight comes on the heels of heavy weekend rains. On Sunday, Sept. 29, as much as 0.98 inch of rain was reported in the MWRD service area, following 2.6 inches of rain recorded between Friday morning, Sept. 27 and Saturday morning, Sept. 28. MWRD water reclamation plants (WRPs) and the MWRD’s Tunnel and Reservoir Plan (TARP), consisting of 109 miles of tunnels and three reservoirs, are working around the clock to keep up with the flow. The McCook Reservoir Stage I is at near capacity, holding 3.5 billion gallons of water with an additional 1.6 billion gallons in the adjoining tunnel systems. The water will be pumped back to MWRD WRPs for treatment when conditions permit. To see a live stream of the reservoir, visit