What Twin Lakes Offers

Twin Lakes sits at 8,600 feet in the Sierra Nevada, about 15 miles southwest of Mammoth Lakes along Highway 395. The lake system—actually two connected basins—holds rainbow and brown trout in cold, clear water that stays productive year-round for anglers willing to handle the elevation and weather. The upper lake is shallower and weedier; the lower lake runs deeper and clearer, and the two connect through a narrow channel that concentrates fish during certain seasons.

This is not a destination for beginners or casual visitors. The drive from Mammoth takes 30 to 45 minutes on a winding mountain road, and the lake sits closed by snow from November through May most years. But if you can time the open season and handle the altitude, Twin Lakes rewards you with fewer crowds than Mammoth's town lakes and a genuine high-country experience.

Key Takeaways

  • Twin Lakes opens when Highway 395 clears of snow, usually late May or early June, and closes again by November.
  • The lower lake holds larger browns and rainbows; the upper lake produces more fish but they run smaller.
  • Boat access and shore fishing both work, but the narrow channel between the lakes concentrates fish during spring and fall.
  • Bring your own boat or rent one at the marina; no public launch fee, but services are limited and weather can close the road without warning.

When Twin Lakes Is Open and Fishable

The road to Twin Lakes closes when snow makes it impassable, which typically happens by early November and stays closed until late May or early June. Call the Mammoth Lakes Visitor Center or check the Inyo County road conditions before driving—a closed road wastes a full day. Even after the road opens, snow can linger on the water until mid-June, and afternoon thunderstorms are common from July through September.

The best fishing windows are late May through June (spring turnover, fish feeding actively) and September through October (fall cooling, fish moving to shallower water before winter). July and August can be productive but the lake gets busier with day-trippers and the afternoon wind picks up. Winter is out of reach for most anglers unless you have a four-wheel-drive vehicle and experience with snow roads.

How to Fish the Upper and Lower Lakes

The upper lake is shallower, warmer, and holds more aquatic vegetation. It produces more fish overall, but they tend to run 10 to 14 inches. Fish the weed edges in early morning and late evening, and expect to catch-and-release more often than you land keepers. Trolling works here, but so does casting from shore or a small boat along the dam and the eastern shoreline.

The lower lake is deeper, colder, and clearer. The fish run larger—browns in the 16 to 22-inch range are common—but you catch fewer of them. Troll the deeper channels and drop-offs, or cast along the rocky points on the north and south shores. The narrow channel connecting the two lakes is a natural funnel; fish move through it during spring and fall, so spend time there if you see activity.

Both lakes respond to standard Sierra trout tactics: small spinners (size 1 or 2), spoons (1/4 to 3/8 ounce), and soft plastics in natural colors. Fly anglers do well with small nymphs and streamers, especially in the upper lake where weed growth provides cover. Bait fishing is legal but less effective than lures in these clear, cold waters.

Boat Rentals and Shore Access

Twin Lakes Marina operates a boat rental concession during the open season. They rent aluminum boats with small electric motors, which are ideal for this lake—gas motors are not allowed. Rental rates vary by season and boat size; call ahead to reserve, especially on weekends. The marina also sells basic tackle, snacks, and fuel for electric motors.

If you bring your own boat, the launch is free and straightforward. The ramp is at the lower lake near the marina. Shore fishing is productive along both lakes, especially from the dam at the upper lake and the rocky points around the lower lake. Parking is available at the marina lot and at a few pullouts along the road, but spaces fill quickly on summer weekends.

Regulations and What to Bring

California fishing regulations apply. You need a valid state fishing license. The lake is open to year-round fishing when accessible, but the road closure makes winter fishing rare. Check current regulations for any special restrictions on species or size limits before you go—these can change year to year.

Bring layers and rain gear even in summer; afternoon weather turns fast at 8,600 feet. Sunscreen and a hat are essential—the sun reflects off the water and the altitude intensifies UV exposure. If you're driving from Mammoth, fill your gas tank first; there are no services between town and the lake. Bring water and food for the day; the marina has limited supplies and prices are high.

The Drive and Road Conditions

From Mammoth Lakes, head south on Highway 395 for about 10 miles, then turn west on Twin Lakes Road. The road climbs steadily and winds through forest. It is paved but narrow in places, and winter snow closes it completely. Summer thunderstorms can make it slick, and afternoon wind can be strong enough to rock a vehicle on the exposed sections near the pass.

Check road conditions before you leave Mammoth. The Inyo County Sheriff's Department posts closures on their website, and the Mammoth Lakes Visitor Center has current information. If you're unsure, call ahead. A wasted drive is frustrating; a drive that ends with you stuck on a mountain road is dangerous.

Frequently Asked Questions

Can I fish Twin Lakes in winter?

The road is typically closed by November and does not reopen until late May or early June. Even if you have four-wheel drive, the road is dangerous and services are unavailable. Winter fishing here is not practical for most anglers.

Do I need a boat to fish Twin Lakes?

No. Shore fishing works well, especially along the dam at the upper lake and the rocky points around the lower lake. A boat gives you access to deeper water and the channel between the lakes, but it is not required.

What size fish should I expect?

The upper lake produces more fish in the 10 to 14-inch range. The lower lake holds fewer fish but they run larger, with browns commonly in the 16 to 22-inch range. Larger fish are possible in both lakes but less common.

Is the road to Twin Lakes always open in summer?

No. Afternoon thunderstorms, unexpected snow, and maintenance can close it without warning. Always check conditions before driving, especially if you're coming from out of state or have a tight schedule.

What tackle works best at Twin Lakes?

Small spinners (size 1 or 2), spoons (1/4 to 3/8 ounce), and soft plastics in natural colors are most effective. Fly anglers do well with small nymphs and streamers. Bait fishing is legal but less productive in these clear, cold waters.