Suggested Flies for Mammoth Backcountry area:
Eastern Sierra Hatch Selection

Other Local Favorites:

Dry Flies:
Parachute Adams #16-18
Olive Caddis #16-18
Royal Wulff #16-18
Griffith’s Gnat #16-18
Henrys Fork Hopper
Chernobyl Ant

Nymph Flies:
Hare’s Ear #16-18
Prince Nymph #16-18
Pheasant Tail Nymph #16-18

Directions:

Enter the town of Mammoth Lakes from Hwy 395, take Lake Mary Road to the Duck Pass Trailhead, Lake George to Crystal Lake and Deer Lake Trailhead. Or go to Gondola Station at Mammoth Ski Resort and take shuttle to Rainbow Falls. Trail follows Crater Creek and drops into Fish Creek at Island Crossing.

Notes:

The Mammoth Backcountry consists of a chain of lakes upstream along Mammoth Creek from Lake Mary. The trail goes over Duck Pass and drops into Duck Lake, Purple Lake and Fish Creek. You can loop back to Mammoth following Fish Creek into Fish Valley and head back up to Rainbow Falls near Devil’s Postpile. A shuttle bus will get you back to Mammoth.

Duck Pass Trailhead

From the Duck Pass Trailhead at 9,200′, the trail takes you to Duck Lake on about a 2.5 hour (3.5 mile) hike going up to 10,450′. Duck Lake consists of Rainbows and Brookies. The ‘bows can get up to 2-5 lbs. in this lake. Nearby Pika Lake also contains Rainbows and Brookies. Going further past Duck Lake, you reach Purple Lake at 9,900′ elevation from the PCT. Purple Lake has Rainbows, Brookies, and some Golden/Hybrids. Continuing south on the PCT from Purple Lake is Lake Virginia: (98 acres) at an elevation of 10,320 feet known for large Goldens. They have been planted since the 1930’s and the California State record was caught here in August, 1952 at 9 lbs 8 ounces. The lake does not have adequate spawning tributaries to enhance the population but does have a rich source of insect life to allow the few Goldens to get to a size of 11-16 inches. Distance from Duck Pass Trailhead is 12 miles.
The first part of the trail is a moderate hike going to Arrowhead, Skelton, and Barney Lake. Arrowhead Lake (12 Acres) is about one mile from the trailhead at 9,800′. It is shaped like an arrowhead with a large rock outcropping on the southern end. The preferred areas to fish are the inlet and outlets of this lake. A side-trail will take you to the lake. Arrowhead Lake holds Brookies and Kamloop Rainbows of a smaller size, 10-13″. Skelton Lake (9,900′ ele) is about 1/2 mile further or another 15 minute walk. Skelton is a 12 acre lake with Brookies. Fish the inlet side among the reed beds. Barney Lake and Red Lake is another 3/4 mile or 30 minute hike further at 10,100′. At Barney, a 9 acre lake, fish the shoreline opposite the trail. Both lakes contain Brookies. Barney Lake was named after Bridgeport resident, Barney Peeler. There are two Woods Lakes, a lower and upper. The lower lake has brookies while the upper lake contain Rainbows.

From the Duck Pass Trailhead you can take a different trail going to Emerald Lake and also back to Lake George. Emerald Lake contains Brookies. Hammil Lake and Way Lake can be reached by going off-trail from Emerald to the West. Hammil Lake contains Brookies while Way Lake is fishless.

At the Duck Lake Trailhead is another trail that veers to the east to Heart Lake. Heart Lake is at 9600 feet and is less than a mile from the trailhead. Heart Lake contains Brookies.

Lake George Trailhead

Crystal Lake (13 acres) can be accessed by the trailhead at Lake George, elevation 9160 feet. It’s a 45 minute hike going a little over one mile and a 600′ elevation gain to 9550 feet. Crystal has been identified with Brooks, Rainbows, and Browns in the 9-12″ size. However, a survey by DFG in 2003 indicates that only a self-sustaining population of Goldens exist. About 4.5 miles from the Lake George Trailhead are the Deer Lakes. There are three lakes of about 10 acres each at 10,600 feet elevation and a 2200 foot gain. Each lake contains Rainbows. The waters of Deer Creek below the lakes to the PCT also have Rainbows.

Rainbow Falls Trailhead

From Rainbow Falls TH, you follow the trail along Crater Creek. There is no access to the MF San Joaquin due to the steep topography. The trail reaches Fish Creek at Island Crossing. Continue upstream as the canyon gets steep and impassible going downstream. Fish Creek has plenty of Brookies and Rainbows. The trail reaches Iva Bell Hot Springs and connects back to Fish Creek with nearby Second Crossing.

Sharktooth Lake: Fishing is considered poor here.
Sharktooth Creek: Paiute Cutthroats were planted here in 1968 and covers a 2 mile stretch of the stream. Surveys have been conducted in 5 year intervals since 1999 with the determination that a stable population continues with most fish in the 6-9 inch class. The stream has some good natural barriers near the confluence of the Lower Lost Keys Lake and a low gradient section upstream where the cutthroats were placed. Beyond this section is a steep gradient to the outflow of Sharktooth Lake. This stream is open to fishing since the Paiutes are not within it’s native range and is difficult to access.
Lost Keys Lakes: There are three lakes about 5 acres in size. Each lake has self-sustaining populations of Rainbow Trout. Going off-trail you can reach the Bench Lakes, the largest lake also has Rainbows.
Long Canyon Creek: This creek is a small, rapid, alpine trout stream that contains brookies. Good Access with trail following the creek.
Marsh Lake: This lake is fishless.

Downstream from Island Crossing is the confluence of Fish Creek with Stairway Creek. Stairway Creek is of note since Paiute Cutthroats have been planted into this creek as well as Sharktooth Creek. The Paiutes were planted in 1972. Surveys have found stable populations within the creek of 4-7 inches. The creek in inaccessible except from the westside at Mammoth Trailhead. Both ends of the creek have extreme gradients and the fish remain within the moderate gradient of the stream where the trail (26E16) terminates. See Isberg Pass (West Side Sierra)

Fishing Regulations

Duck Pass Lakes from Lake Mary to Barney Lake:

Open all year, 5 trout daily bag limit, 10 trout in possession.

Duck Lake and Deer Lakes:

Open all year, 5 trout daily bag limit, 10 trout in possession.

All lakes and reservoirs except those in Inyo and Mono counties with exceptions  :

Open all year, 5 trout daily bag limit, 10 trout in possession.

All other creeks and tributaries: