Unit 620

Major features include Fort Peck Reservoir itself, visible across the south portion and serving as geographic anchor. Internally, Lake Bowdoin and Whitcomb Lake offer water reference points in the open country. Brandon Butte, Old Scraggy Peak, and the Larb Hills provide modest elevation for glassing pronghorn from distance.

Named bottoms—Kepple, Le Clair, Manning, Bell—mark river and creek confluence areas where deer congregate. Ridge roads like Robinson Ridge and Blue Ridge serve as navigation corridors and glassing routes across the prairie. The Pelican Islands and other reservoir features help orient yourself in what can feel like featureless country.

Terrain stays remarkably consistent throughout, hovering in the 2,000 to 5,700-foot band with most country in the 2,500-foot range. This keeps you on genuine prairie grassland and sagebrush flats—no significant timber or high-elevation transitions. Scattered low ridges and buttes rise above the plains, offering vantage points for glassing.

The landscape alternates between open shortgrass prairie suitable for pronghorn movement and deeper coulees and creek bottoms lined with willows and sparse brush. Alkali flats and dry lake beds interrupt the grassland, creating visual navigation markers and occasional water dependence zones.

Fair road access with 1,652 miles of total roads scattered across the unit, but roads cluster around ranches and reservoirs rather than spreading evenly. Ranch roads and some maintained routes like CMR Road 425 and various county roads allow vehicle access to staging areas, but much productive country requires hiking from parking areas. Highway 2 provides easy entry from Dodson, Malta, or Saco.

Most pressure concentrates along accessible reservoir areas and near ranch roads; the expanse of open prairie between developed points sees less pressure. Solitude is achievable by hiking deep into the rolling grassland away from visible road access.

Unit 620 encompasses much of Phillips, Valley, and Blaine Counties, anchored by the Fort Belknap Indian Reservation to the west and Fort Peck Reservoir to the south. The Missouri River forms the southern boundary, with US Highway 2 defining the northern edge near Saco and Dodson. The unit sprawls across roughly 100 miles east to west, encompassing the big prairie country between the reservation and the CMR area.

This is the Hi-Line country—high plains grassland interspersed with reservoir systems and drainage bottoms that create natural corridors and gathering areas for pronghorn.

Water is limited and scattered, critical to understand for pronghorn movement patterns. Fort Peck Reservoir dominates the southern portion and provides perennial water, but much of the unit lies 15+ miles north where dependence shifts to smaller lakes, springs, and seasonal creeks. Lake Bowdoin, Whitcomb Lake, and several reservoirs scattered across the prairie (Bell, Twin Snag, Manning Corral, Point of Rocks) anchor water sources.

Creeks like Antelope, Cabin, Mud, and Sevenmile run seasonally or during specific periods. Named springs—Robinson, Chandler, Half Moon, School Section—exist but reliability varies. Water scarcity means pronghorn must concentrate at reliable sources, creating predictable patterns.

Unit 620 is pronghorn-focused country—the prairie grasslands and open sight lines define the hunt. Early season focuses on water sources where pronghorn gather during hot weather; identify springs and lakes as concentration areas. Mid-season tactics shift to ridge and butte glassing, using modest elevation to spot pronghorn moving across the prairie.

Late season often pushes animals toward lower, sheltered country near creeks and river bottoms. The key is patience and optics—this is not close-range hunting. Set up on ridges with clear views across multiple miles, glass methodically for bedded or moving animals, then plan stalks through draws and coulees to approach within range.

The open terrain rewards early mornings and late evenings when pronghorn move between feeding and bedding areas.