Built in 1958 in Lovell, this rearing station was named for the Tillett Ranch. The owners of the ranch granted a 99 year lease to the Game and Fish Department for the acreage. The property is located a short while from the Pryor Mountain Wild Horse Range and the Montana border.

Tillett Springs is an ideal location to rear fish. Two springs supply over 1300 gallons of water each minute at 54 degrees F. Two ponds contain the fish, one for when they grow to stocking size and another to hold brood stock. There are also twelve large concrete raceways. An isolation hatchery for fish suspected to carry disease, and also for the use of experimental incubation, is in the process of being considered for the facility.

The facility raises a number of species of trout. A brood stock of Eagle Lake Rainbow trout is contained in one of the earthen ponds.

The trout fishing is said to be very worthwhile in the nearby alpine lakes of the Big Horn Mountains.