Union Valley Reservoir: Where Legends Are Made & Trolling is an Art

Nestled high in the Sierra Nevada mountains of California, Union Valley Reservoir is more than just a lake—it's a pristine, high-altitude fishing sanctuary. At nearly 5,000 feet of elevation, its crystal-clear, glacier- fed waters are home to a diverse population of trophy-sized trout and salmon. Whether you're a seasoned angler chasing a record catch or a family looking to create unforgettable memories, Union Valley offers a fishing experience unlike any other. This is your ultimate guide to unlocking the secrets of this legendary lake, from mastering the techniques to uncovering the local lore.

What's Biting at Union Valley?

Union Valley Reservoir is a mixed bag of some of California's most prized cold-water fish. The main species you'll encounter are: Kokanee Salmon: These landlocked salmon are the bread and butter of Union Valley's fishery. They are known for their feisty fight and delicate, orange-colored meat. They are also known for being a bit of a challenge to catch, making them a prize for any angler. Mackinaw (Lake Trout): This is the lake's true "trophy" fish. Mackinaw can grow to incredible sizes, often dwelling in the deepest, coldest parts of the lake. Rainbow Trout: Regularly stocked by the California Department of Fish and Wildlife (CDFW), rainbow trout are abundant and a great target for both boat and shore anglers. Brown Trout & Smallmouth Bass: While less common, these species add to the lake's diverse ecosystem. Brown trout are known for being particularly wary, making them a rewarding catch.

Mastering the Techniques: Bait, Lures & The Art of Trolling

The key to a successful day on Union Valley is adapting your technique to the fish you're targeting and the time of year.

Trolling: The High-Stakes Game

Trolling is arguably the most effective way to cover water and find fish on this large reservoir, especially for Kokanee and Mackinaw. For Kokanee: The secret is a combination of color, flash, and scent. Trollers use downriggers or lead core line to get their lures down to the 50-70 foot depth where Kokanee often school. The most popular setup is a bright dodger or flasher in pink, orange, or green, followed by a short leader (10-14 inches) to a small Kokanee lure like an Apex, a hoochie, or a small spoon. The lure is almost always tipped with a kernel of scented white corn. Trolling speed is critical; aim for a slow 0.8 to 1.5 mph. For Mackinaw: Trolling for these giants requires a different approach. Heavier gear is used to troll larger spoons, plugs, or even live bait at very deep depths, sometimes over 100 feet. Look for them on your fish finder near ledges, underwater points, and deep drop-offs.

Bait & Lure Fishing: The Classic Approach

Not a troller? No problem. Union Valley offers fantastic opportunities for bank anglers and those who prefer a more hands-on approach. Bait Fishing: The best bet for Rainbows is to use a simple sliding egg sinker rig with a salmon egg or scented powerbait. Cast out from the shore and let it sit on the bottom. Early mornings and late evenings are the prime times for this method. Casting & Jigging: Anglers targeting Mackinaw can have great success jigging spoons or grubs right off the bottom in deep water. This is a popular technique for shore anglers who have access to deep sections of the lake near the dam or spillway. For Rainbows, casting small spinners like Mepps or Panther Martins or spoons like a Kastmaster can be very effective, especially around submerged structures.

Where to Drop a Line: Hotspots on the Lake

Knowing where to go can make all the difference. While the fish are always on the move, these areas are known to be productive: The Dam & Spillway: The deepest parts of the lake are found here, making it a prime location for trophy Mackinaw. Anglers with boats often troll the face of the dam, while shore anglers can jig or cast from the rocks. The Peninsula: This area, located near the main boat launch, is a favorite for shore anglers due to its easy access and deep water. It's a great spot for targeting both rainbows and Mackinaw. The Coves: Coves and creek inlets are excellent for casting lures or bait, especially in the early season when fish are in shallower water. The calmer waters are also great for a peaceful day of fishing.

Lake Lore & Record Catches

Union Valley Reservoir is a place of big fish and even bigger fish stories. The Mackinaw Monster: While official lake records are difficult to verify, the whispered tales of giant Mackinaw are not. It's widely rumored that Mackinaw weighing well over 20 pounds have been pulled from the lake's depths. The current state record for Mackinaw is over 37 pounds, so while Union Valley's fish may not reach that size, it's not uncommon to land a trophy in the 10 to 15-pound range. The Elusive Brown Trout: Brown trout are stocked in Union Valley but are notoriously difficult to catch. They are known to be ambush predators that lurk in submerged rock piles and fallen trees. Any angler who lands a Brown Trout from this lake has a true bragging-rights fish! Rumors of the "Mystery Fish": Local anglers have reported occasional glimpses of incredibly large fish that are not Mackinaw, Kokanee, or Rainbows. Some speculate these are giant smallmouth bass that have grown to an enormous size due to the lack of fishing pressure on them. Others believe they could be ancient, un- documented fish that have lived in the depths for decades.

Ready to Go Viral with Your Own Catch?

Fishing at Union Valley Reservoir is a challenge and a reward all at once. The serene beauty of the Sierra Nevada, combined with the thrill of reeling in a feisty Kokanee or a massive Mackinaw, makes for an unforgettable family adventure. The stories you'll share will be as legendary as the fish themselves. So, pack your gear, launch your boat, and get ready to cast a line into a lake where every ripple holds the promise of a trophy.

Fishing Gear & Tackle Store

Find all the top fishing gear and supplies for your next fishing adventure at the Mendenhall Outdoors Fishing Gear & Tackle Store.

Union Valley Reservoir Fishing Guides and Charter Boats

There are many different fishing guides that offer guided fishing trips on Union Valley Reservoir. FishingBooker is a service of local guides that you can choose from and schedule your next guided fishing trip. Book a Fishing Guide today on Fishing Booker to catch some quality fish and learn about this excellent fishery. Shop for fishing tackle in our Fishing Gear and Tackle store that would be perfect for catching more fish at Union Valley Reservoir.

Cottages and Vacation Home Rentals At Union Valley Reservoir in CA

Looking for place to stay on Union Valley Reservoir in CA, or any destination you wish to go? Expedia has vacation homes, hotels, motels, cabins, and cottages for many locations that would be great for your next family vacation, all at really great prices. Start your adventures today.

About The Author

Mike Mendenhall is the the founder of Lunker Hunter. This website is an extension of the Mendenhall family’s lifestyle and passion for the great outdoors. Everything that they learn, and experience, along the way that they find may be valuable to our website visitors is on the site for you to enjoy. We highlight products and services that you might find interesting. We frequently receive free products from manufacturers to test. This does not drive our decision as to whether or not a product is featured or recommended. If you click a link on this page, then go on to make a purchase, we might receive a commission – at no extra cost to you, and does not impact the purchase price of any products that you may purchase.