Lake Elwell, formed by the Tiber Dam on the Marias River, is a prominent recreation area in north-central Montana offering extensive water-based activities. With over 21,000 water surface acres and 181 miles of shoreline, it is a prime spot for fishing northern pike, walleye, and rainbow trout. The area features concrete boat ramps, campgrounds, a marina, and picnic shelters, making it ideal for various outdoor pursuits.