Muir Lake is a popular fishing area located in the San Gabriel Mountains of California. The lake is stocked with rainbow trout, largemouth bass, and bluegill, making it a great spot for both fly and bait fishing. Nearby activities include hiking, camping, and picnicking. Fishing tips include using lures or flies that resemble the lake’s native insects, and fishing near the lake’s drop-offs or inlets. The best time to visit is during the spring and fall when the water is cooler, and temperatures average around 60-70 degrees Fahrenheit.