Unit 140 North Slope, Three Corners
High-desert plateau in Utah's far northeast corner — Flaming Gorge canyon country, pronghorn and general-season desert mule deer.
Northeast Utah — Flaming Gorge / Three Corners · Last reviewed 2026-07-12
Area
226
sq mi
Public land
82%
approx.
Elevation
5,600–8,500
feet
Motorized
extensive
access
Overview
North Slope, Three Corners occupies the far northeast corner of Utah where the Wyoming and Colorado lines meet, wrapping the east side of Flaming Gorge Reservoir and the Green River canyon around Dutch John. Unlike the alpine Uinta units to the west, this is rolling high-desert plateau — flat sage ridges cut by creek drainages, with the Green River and Flaming Gorge carving a deep canyon on the south edge. It's a general-season mule deer unit, a strong pronghorn unit for the plateau grasslands, and offers limited-entry elk.
Terrain
Rolling high-desert plateau of flat ridges and shallow creek valleys, dropping sharply into the Green River / Flaming Gorge canyon along the southern edge. Open, big-country terrain near Dutch John, Clay Basin and Goslin Mountain.
Cover: Grass, sagebrush, pinyon pine and juniper across the low and mid elevations; cottonwoods along the river and streams; scattered conifer patches on the steeper, higher slopes.
Landmarks: Flaming Gorge Reservoir · Green River canyon · Dutch John · Clay Basin · Goslin Mountain · Lucerne Point
Access
Predominantly BLM plateau with Ashley National Forest / Flaming Gorge NRA ground near the reservoir and SITLA scattered throughout. Private inholdings cluster around Clay Basin and the river bottoms. Two-track and improved roads give good motorized access across the open plateau; US-191 and SR-44 are the main arteries.
Managers: BLM, USFS Ashley NF, SITLA, private
Access points: US-191 · SR-44 · Dutch John · Clay Basin Road · Flaming Gorge NRA access roads
Species notes
Pronghorn
common qualityThe open sage-grass plateau of the Three Corners country holds pronghorn; a limited-entry buck opportunity on classic high-desert antelope ground.
- →Glass the flat sage ridges from vehicle-accessible high points at first light
- →Cover ground between water sources and feed
- →Use terrain folds to close the distance on bucks in open country
Mule Deer
common opportunityGeneral-season desert mule deer using sage, pinyon-juniper and the canyon rims; bucks favor rough breaks near the Green River.
- →Hunt the pinyon-juniper and canyon-rim edges above the river
- →Glass draws and pockets of cover in the open plateau
- →Focus on transition ground between feed and broken canyon country
Rocky Mountain Elk
limited qualityElk use the higher, more timbered pockets and canyon country; managed on the limited-entry side across the Three Corners/West Daggett complex.
- →Target the conifer patches and rough canyon heads
- →Hunt water and cover during dry early seasons
- →Glass at the edges of the more broken, timbered ground
Black Bear
limited opportunityBlack bears are present but sparse in the river-corridor and higher timbered pockets of this largely arid unit.
- →Check riparian and berry-bearing pockets along the Green River
- →Focus effort on the wetter, timbered fringes
- →Expect low densities across the open desert
Cougar
common opportunityMountain lions follow the deer through the canyon and pinyon-juniper breaks of the Flaming Gorge country.
- →Cut tracks in fresh snow along canyon rims and two-tracks
- →Hunt where deer concentrate in the breaks
- →Work the rugged Green River canyon edges
Pro tips
- →This is glassing country — set up on plateau high points and cover big sage flats with quality optics
- →For deer, work the canyon rims and pinyon-juniper breaks above the Green River
- →Locate reliable water early; it patterns both pronghorn and deer in the dry country
- →Watch for private inholdings around Clay Basin and the river bottoms
- →Take advantage of extensive two-track access to cover a lot of ground
Watch out for
- !Private inholdings near Clay Basin and river bottoms — verify boundaries
- !Scarce water on the open plateau — pack your own
- !Flaming Gorge NRA-specific rules and closures near the reservoir
- !Big, exposed country with sudden wind and temperature swings
- !Remote roads that turn greasy when wet
Logistics
Dutch John and Manila are the local hubs with limited services; Vernal to the south and Rock Springs, WY to the north offer full fuel, lodging and supplies. Access is easy by vehicle on US-191 and SR-44, but the plateau is remote — carry water and be self-sufficient. Flaming Gorge NRA rules apply near the reservoir.
Nearest towns: Dutch John, Manila, Vernal, Rock Springs, WY
Seasons & regulations
This page carries no season dates or regulations. Get current rules from the official Utah sources:
Research sources: UDWR Hunt Planner — Three Corners boundary description · UDWR North Slope Deer Herd Unit Management Plan (#8), 2020 · GOHUNT Utah North Slope, Three Corners/West Daggett unit profiles
FAQ
- How big is Unit 140 in Utah?
- Unit 140 (North Slope, Three Corners) covers about 226 square miles, ranging from roughly 5,600 to 8,500 feet in elevation. Area is computed from the unit boundary polygon.
- How much public land is in Unit 140?
- Approximately 82% of the unit is public land. Primary managers: BLM, USFS Ashley NF, SITLA, private. Always verify ownership boundaries on the ground.
- What species does the catalog list for Unit 140?
- Pronghorn, Mule Deer, Rocky Mountain Elk, Black Bear, Cougar. For seasons, tags, and regulations, use the official Utah agency resources linked on this page — this page carries no regulatory information.
Put Unit 140 on your map.
Boundary lines, public/private ownership, topo, and offline maps for this unit — in Baseline Maps, free for 14 days.