I suspect the downstream water rights owners were calling for X amount to fill their reservoirs for the sping so Chatfield released a shit load of water. Now that Bear Creek, Clear Creek, Boulder Creek(s), St. Vrain, Big T, Poudre, etc. are all big time running to the Platte drainage, there is less need to send stored water out of Chatfield. So they cut it off. Happens every year about this time.