With inflow into Dillon Reservoir reaching 1,700 cubic feet per second (cfs) on Monday, Denver Water's high country lake filled to capacity and started to overflow through the glory hole for the second year in a row.
That's a relief for Colorado water managers after several years of sustained drought, but this season's runoff didn't bring the anticipated high water levels in local streams. An unusually dry spring - one of the driest on record in parts of the state - evaporated some of the snowpack before it had a chance to melt.
Denver Water managers Marc Waage and Bob Steger said they expect outflow from Dillon Reservoir to peak at somewhere between 600 and 1,200 cfs, between June 9 and June 12. After that, the flows should slowly decline through early July.
Raftable flows of 500 cfs or more in the Lower Blue may last for a few weeks in the middle part of the month, according to Steger.
Monday's inflow was tempered by diversions through the Roberts Tunnel. Denver Water is sending about 500 cfs under the Continental Divide into the South Platte drainage, said Silverthorne public works director Bill Linfield.
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