The Grove Trout Rearing Station is a Nebraska Game and Parks facility that raises rainbow trout for stocking waters around the state. It sits north-east of Royal in Antelope County, beside Grove Lake and the Grove Lake Wildlife Management Area, and its long rearing ponds are visible from the road.
The station has historically been open to visitors walking the grounds. Game and Parks currently list it as closed to general public visitation, citing construction and stress on fish health, with no reopening date announced - but they also ask that anyone wanting a tour contact the station in advance to arrange one. So it is worth ringing rather than assuming the door is shut.
Phone 402-893-5468. The station is a few minutes from Ashfall Fossil Beds State Historical Park and Grove Lake, which makes it worth checking if you are planning a day in this corner of Antelope County.