Remember that there are two types of water in the river: natural flows and reservoir releases. Just because there's water below a reservoir doesn't mean it's releasing, it could just be passing through.The call on the South Platte is VERY senior right now, which may have something to do with the low below Chatfield flow. The call is senior because it's been dry as Cheney's tears on the plains (that includes Denver, in the plains). A few major gully washers above Chatfield in the Plum Creek drainage, and Chatfield will probably begin passing more water through...looking stormy out there right now...go Monsoon season!
I believe that the max fill rate of the Centennial reservoir is about 70 cfs, and that they will not be taking that much for some time. Strontia is just a little forebay for DWB, it really doesn't store much water. (Strontia was meant to be a forebay for the Two Forks Reservoir, only the bigger pond never got built, so it's a bummer that they built Strontia, which prematurely ends a fantastic canyon.)
On the bright side, even though Union and Confluence are low, there's lots of other stuff that is going strong. Take for example Metsewco: Denver is flushing a total 250 cfs of wastewater. Peak brown flow is around noon, so err..git sum son...or whatever that means.
Here's a South Platte system update as of now (I'm not privy to forecasts): Cheeseman is more or less passing, Chatfied is storing about 250 cfs, Strontia is more or less passing (as per ususal). Roberts is bringing in about 350 from Dillon to the NFSP, and most of that is then diverted near Strontia above Chatfied by Denver's municipal system. The Highline Canal is off.
It's been so dry for so long that I'd hesitate until after the first Tstorm runoff surge before getting in the metro South Platte.