Diamond Lake   Be the first to submit input for Diamond Lake. If you have info on Diamond Lake, Brown County, Nebraska please submit it here to improve this web site.          These outdoors activities are available near Diamond Lake.   Public Lands Near Diamond Lake: Niobrara National Scenic River, O'Neil - NE, 50 miles away   Hotels Near Diamond Lake: Super 8 Ainsworth, Ainsworth, 21 miles away Rodeway Inn Ainsworth, Ainsworth, 21 miles away Trade Winds Lodge, Valentine, 48 miles away Dunes Lodge and Suites, Valentine, 48 miles away Super 8 Valentine NE, Valentine, 48 miles away