A cache near Milton Seaman Reservoir. Seaman Reservoir is formed by a dam near the downstream end of the North Fork of the Cache La Poudre River, just before it joins with the mainstem. The reservoir is owned by the City of Greeley and is a part of the city's water supply system. Water is stored in the reservoir when there is plenty of flow in the river, and released later to supplement the natural flow. The reservoir can hold about 5,000 acre-feet of water, with one acre-foot equal to the water that would cover an acre of land 1 foot deep. Greeley is currently in the planning and permitting process to expand the reservoir to more than 10 times the current volume, up to over 50,000 acre-feet. This is one of 3 currently proposed reservoir projects in the Poudre Basin, along with Fort Collins' expansion of Halligan Reservoir further up the North Fork and the proposed new off-channel Glade Reservoir near Ted's Place.
On the way to the cache (if you take the same route I did) you will pass by the rather cool stepped spillway before walking up the edge of the dam embankment. I find the water infrastructure in Northern Colorado pretty interesting, with all the work that has been done over the last ~150 years to move water in space and in time to get it where it can be used by the population.
The distance from parking to the cache is a bit less than 2 miles, with little elevation gain. There are some steep sections along the informal trail however. Fishing is allowed in the reservoir, though swimming is not. Parking at Gateway Natural Area costs $6 except December - February when its free.
Unfiltered Greeley Water
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