Boulder Mountain Lakes, Utah: A Complete Fly Fishing Guide

Boulder Mountain is the forested top of Utah's Aquarius Plateau above Torrey, Teasdale and Boulder, with more than 80 lakes, ponds and reservoirs holding brook trout, tiger trout, splake, cutthroat and Arctic grayling. Fish the low lakes from late April, the Boulder Top lakes from late June, and fall for the best feeding.

Boulder Mountain is a long drive south from my home water around Park City, and it is a different world from the Wasatch tailwaters: no flow charts, no hatch to wait on at a riffle, just stillwater sitting in aspen and spruce above the red rock of Capitol Reef. On a mountain like this, getting there is half the puzzle, and most of what goes wrong is logistics and depth, not fly choice.

This guide sticks to what the Utah Division of Wildlife Resources (DWR), the U.S. Forest Service and Visit Utah actually publish, plus what our guests have said on the Fly Fishing Insider Podcast about fishing remote lakes. Where a lake is named, there is an official source behind it.

Boulder Mountain at a glance

• Where: South-central Utah, the high, timbered top of the Aquarius Plateau in Garfield and Wayne counties, just outside Capitol Reef National Park. Public land on the mountain is split between the Dixie National Forest and the Fishlake National Forest, whose Fremont River Ranger District administers the Boulder Mountain area.
• Elevation: Visit Utah puts the area at roughly 7,000 to more than 11,000 feet.
• Waters: More than 80 lakes, ponds and reservoirs, per Visit Utah. The DWR rates Boulder Mountain a Blue Ribbon Fishery.
• Species: Brook trout, tiger trout, splake, cutthroat (including Colorado River cutthroat), Arctic grayling, and stocked rainbows in some roadside lakes.
• Nearest towns: Torrey and Teasdale on State Route 24; Boulder and Escalante on Scenic Byway 12; Bicknell and Loa to the north.
• Regs: 2026 Utah Fishing Guidebook; statewide limits apply unless a lake is listed by name.

Where Are the Boulder Mountain Lakes and How Do You Get There?

The Boulder Mountain lakes sit on a plateau that the Garfield County tourism office describes as the highest timbered plateau in North America. Three approaches cover nearly every lake:

From the north: Boulder Top Road (Bicknell and Torrey)

Visit Utah describes the dirt Boulder Top Road running north to south off State Route 24, starting about 2.5 miles east of Bicknell and passing the Perry Egan Fish Hatchery on the way up. This is the route to the Boulder Top lakes, and the top is the last part of the mountain to melt out.

From the east: Scenic Byway 12 (Torrey to Boulder)

Scenic Byway 12 between Torrey and Boulder is the paved side of the mountain. Lower Bowns Reservoir is the easy one: the Forest Service campground listing puts it on the east side of Boulder Mountain, reached by taking Highway 12 south from its junction with SR-24 near Torrey for 16 miles, then Forest Road 186 for 5 miles. Visit Utah says passenger cars can make that dirt and gravel road. From the same highway, Visit Utah lists trailheads to Boulder Top at Bowns Point (Great Western Trail, via FR 554), Behunin Point (Trail 117, via FR 247) and Meeks Lake (Trail 118, also off FR 247, an unimproved four-wheel-drive road).

From the south and west: Escalante and the Hells Backbone Road

From Escalante, the Hells Backbone Road becomes Forest Road 153. The Forest Service routes Posey Lake Campground off FR 153 onto FR 154, and McGath Lake (north of the Hells Backbone Road) via FR 566 to the Boulder Swale ATV Trailhead, the only motorized access to that lake. The North Creek Lakes, including Round Willow Bottom, Barker Reservoir and Dougherty Basin, are reached from Highway 12 west of Escalante on the North Creek Road (FR 149) to the Upper Barker Reservoir parking area, then on foot on the Barker Lakes Loop trails.

Do you need a 4x4 or an ATV?

Not for every lake. Lower Bowns and Posey are reachable on dirt roads, but some Boulder Mountain lakes need an off-highway vehicle and others need a hike. On the Dixie National Forest, only routes shown on the Motor Vehicle Use Map are open to motor vehicles and cross-country travel is prohibited. Utah also requires OHV operators to complete the state OHV education course, and nonresidents need a permit to ride on public lands. The Boulder Swale ATV Trail is limited to machines under 50 inches wide.

From Salt Lake City, the usual route to the north side is I-15 south, I-70 east, then State Route 24 south through Loa and Bicknell to Torrey and Teasdale.

What Fish Live in the Boulder Mountain Lakes?

Boulder Mountain is a brook trout mountain first. The Utah state record brook trout, 7 pounds 8 ounces, came from Boulder Mountain in 1971, according to the DWR state fish records, and the catch-and-release brook trout record (23 inches) is from Boulder Mountain too. Visit Utah reports that the state manages 35 percent of the lakes for trophy brook trout and 83 percent with a trophy fish component, which means fewer, bigger fish and slower days.

• Brook trout: the backbone of the mountain. Some lakes carry a 16 brook trout limit (see regs below) because thinning them out is the point.
• Splake: a brook trout and lake trout cross. The DWR's fall report names brook trout and splake as the fish that turn aggressive before spawning.
• Tiger trout: a sterile brook and brown trout hybrid, stocked by the DWR in lakes including Lower Bowns, Posey and Round Willow Bottom.
• Cutthroat: Visit Utah notes biologists have set aside specific waters as Colorado River cutthroat strongholds; Dougherty Basin Lake is closed to keeping any cutthroat.
• Arctic grayling: not native to Utah, but stocked by the DWR in several of the mountain's lakes, including Blind Lake.

What did the DWR stock in 2026?

The DWR fish stocking report is the best way to see what is in a lake right now. A sample of 2026 records for lakes with an official Boulder Mountain source:

Most of the 2026 brook trout, tiger trout, splake, cutthroat and grayling plants listed above were fingerlings of roughly 2 to 3 inches; the exceptions are the 10-inch tiger trout in Lower Bowns and the rainbows in Posey. Those fingerlings are the bigger fish of a few seasons from now, not this weekend's dinner.

Boulder Mountain Fishing Regulations (2026 Guidebook)

The 2026 Utah Fishing Guidebook lists "Boulder Mountain lakes and reservoirs, Garfield and Wayne counties" with one blanket rule and a set of lake-by-lake exceptions. Anything not named follows statewide rules, which allow 4 trout a day (trout, kokanee and Arctic grayling combined).

• Motors: fishing from a boat with a motor is unlawful except at Wide Hollow Reservoir, Pine Lake and Lower Bowns Reservoir.
• Winter closures: a number of Garfield and Wayne county lakes are closed from January 1 through 6 a.m. on the third Saturday of April, and again November 1 through December 31. In the 2026 guidebook these include Fish Creek Reservoir, Beaver Dam Reservoir, Bulberry Lakes, Honeymoon Lake, Pine Creek Reservoir, McGath Lake, Pacer Lake, Round Willow Bottom Reservoir, Scout Lake and Solitaire Lake.
• Dougherty Basin Lake: closed to possession of cutthroat trout or any trout with cutthroat markings; artificial flies and lures only; closed January 1 through 6 a.m. on the second Saturday of July.
• Upper Bowns Reservoir (Oak Creek Reservoir) and Donkey Lake: limit 16 brook trout.

Rules change every year, so read the current Utah Fishing Guidebook before you go; the DWR lists closed lakes under their own names, not under "Boulder Mountain."

How much is a Utah fishing licence for Boulder Mountain?

A Utah fishing licence is required for anglers 12 and older. On the DWR fee schedule, resident licences start from $19 for 3 days or $40 for 365 days (ages 18-64). Nonresident licences cost $44 for 3 days or $120 for 365 days (ages 18 and older); confirm the price when you buy online.

When Is the Best Time to Fish Boulder Mountain?

The best time to fish Boulder Mountain depends on elevation more than the calendar. The DWR's spring report gives the access windows below, its high-elevation guidance says fishing is typically good from July into late September or early October, and its fall report calls autumn some of the best fishing of the year on the mountain.

Snowpack shifts these windows every year. Call the Fremont River Ranger District or the Escalante Interagency Visitor Center (435-826-5499) for road conditions before a high-country trip.

How Do You Fish the Boulder Mountain Lakes?

The first variable on a Boulder Mountain lake is depth, not the fly. Brook trout and splake in a clear, cold lake hold where food and cover meet: the shallow shoal, the drop-off where it falls into deeper water, and the inlet or outlet. Find that edge, put the fly at the depth the fish are using, then worry about pattern and retrieve.

Read the lake before you rig

• Shoals and drop-offs: cruise the edge where the light-colored bottom turns dark. Fish move up onto the shoal in low light and drop back over the edge in bright sun.
• Inlets and outlets: moving water carries food into the lake and concentrates fish.
• Rockslides and talus: where boulders run into the water, there is cover and food along the face.

Three ways to cover the water column

• Indicator and balanced leech or scud: set the fly a foot or two off the bottom on a shoal or along the drop-off. Measure depth with forceps clipped to the fly before you start, then adjust.
• Countdown with a sinking line: cast, count, start a slow hand-twist or short strips, and note the count when you get bit. Repeat that count. A sink-tip line handles shoals and drop-offs; deeper basins need a full sinking line.
• Dry or dry-dropper on a floating line: on windy summer afternoons, ants and beetles blow onto the water. The DWR lists terrestrials, the double renegade, elk hair caddis, leeches, mayfly patterns and lake nymphs among its high-elevation fly picks.

Can you use a float tube or boat?

Yes, but under the Boulder Mountain rule you cannot fish from a boat with a motor except at Wide Hollow Reservoir, Pine Lake and Lower Bowns Reservoir. Posey Lake allows non-motorized boats and has a boat ramp and docks. A float tube gets you to the drop-off that shore anglers cannot reach.

Flies and Gear for Boulder Mountain

A 9-foot 5- or 6-weight handles the afternoon wind, like the Genesis Fly Rod (starting from $129.99). Carry a floating line for indicators and dries plus a sinking or sink-tip line for the countdown, 4X-5X fluorocarbon tippet, and a rubber-mesh net that is gentle on fish you release, such as the Brookie Net Package. Early and late in the year, insulated waders like the BAYOU 3.5mm neoprene chest wader earn their weight in a float tube. Also worth a slot in the box: Hot Shot Leech, Bead Head Prince Nymph, Renegade, Elk Hair Caddis and Parachute Adams.

Roads up here are rough. A spare tire, recovery gear and camp kit from our Camp, Boat and Overland collection belong in the truck.

Is Boulder Mountain Good for Beginners?

Yes, if a beginner starts at the roadside lakes. Lower Bowns Reservoir and Posey Lake are reachable on dirt roads, have Forest Service campgrounds, and get catchable-size stocked fish (the DWR put roughly 10-inch tiger trout in Lower Bowns and rainbows in Posey in 2026). The Boulder Top and backcountry lakes, managed for fewer and bigger fish, reward experience, patience and a good map.

Camping, Safety and Leave No Trace

• Camping: Lower Bowns Campground (Fishlake National Forest) has vault toilets, no water and no trash service, with a 16-day stay limit; book on Recreation.gov. Posey Lake Campground (Dixie National Forest) has water from Memorial Day to Labor Day, a boat ramp and sites starting from $16 a night, per the Forest Service.
• Weather: Visit Utah warns that afternoon storms are frequent in summer, and the DWR says to be ready for anything from calm and cool to cold and snowy in fall. Get off the open water when thunder starts.
• Go prepared: the DWR's high-elevation advice is to dress in layers, pack enough food and water, tell someone where you are going and when you will be back, stay near the trail, and carry an emergency beacon or satellite device.
• Fire and trash: check current fire restrictions and pack out everything you bring.

More Utah Water to Fish

Pair a Boulder Mountain trip with another Utah stillwater at The Strawberry Pinnacles, or head north to moving water on the Provo River, the Weber River and the Logan River. For winter, read our Green River winter trip report, and for the big picture, The Top 10 Fly Fishing Rivers and Lakes in Utah.

Plan your trip: See our Utah Location Details page for guides, seasons, regulations and tips.

Tight lines, everyone!

By Christian Bacasa, host of the Fly Fishing Insider Podcast. Last reviewed October 2026.

Prices, availability, flight routing and entry requirements change. Every figure on this page is the starting rate published by the lodge or by Frontiers International Travel at the time of writing, per angler, and is a starting point for a quote, not a quote. Seasons, lodge capacity, charter schedules, visa and passport rules and licence requirements can all change without notice. Confirm current pricing, availability and entry requirements with your Frontiers specialist before you book anything.

Sources: Regulations, limits and closures: 2026 Utah Fishing Guidebook. Licence fees: Utah DWR fee schedule. Stocking: DWR fish stocking report (2026). State records: DWR. Access timing, fall fishing and species: Utah DWR fishing reports and high-elevation fishing guidance. Lake count, species, trophy management, Blind Lake and Lower Bowns: Visit Utah, Visit Utah alpine fishing, Visit Utah Boulder Mountain and Boulder Top Trails. Aquarius Plateau: Garfield County tourism. Roads, campgrounds and OHV rules: USDA Forest Service (McGath Lake, Round Willow Bottom, Dixie OHV, Fremont River Ranger District) and Recreation.gov. Stillwater tactics: Kelly Reaume on the Fly Fishing Insider Podcast.