Not saying a development along the creek would be a bad idea, but the flows don't offer much for kayaking. I think your flow estimates are way overly optimistic. I just took a quick look at 2000-2009 data for the Bear Creek at Morrison gauge.
2000: 0 days over 100 cfs, median flows for May = 47, median flows for June = 26
2001: 0 days over 100 cfs, may median = 71, june media = 35
2002: Uh, barely wet - big drought year, median flows < 15 cfs
2003: Ran over 100 cfs for Apr, May, first week of June. Apr med = 170, May median = 124, June median = 93.9
2004: 0 days over 100 cfs, May median = 60, June median = 46
2005: over 100 cfs: half of april, all of may, 1/4 of june, apr med =- 86, may median = 146, june median = 95
2006: 0 days over 100 cfs: apr median = 19, may median = 21, june median = 10
Well, you get the idea, right? A good half the years the flow never even goes over 100 cfs. The other years the median flow might crest 150 in the best month and only rarely do you see flows over 200 cfs.
My observation on a WW park is < 100 cfs you're not going to be able to build any worthwhile feature. 100-200 cfs you might be able to get a small hole going good enough to play around in a little.
If I was the city of Morrison I sure wouldn't be thinking this is going to be a big draw for kayakers, esp. with Golden just down the street which gets much higher flows for a much longer season and much mor reliably (not that Golden is a great park, but it at least is wet).
I applaud your initiative to try and get some recreational improvements going, but presenting false data isn't going to be good for anyone. "decent flows of ~ 100 to 400 CFS between May 1 - July 1st." is definitely not true.