Leech Lake is located immediately 1 mile east of White Pass near the Pacific Crest Trail on the north side of Highway 12.  This high elevation (4,412 ft) lake is open to fly fishing only.  It is usually assesible (ice free) by early June.  

The lake has excellent fishing for 8-12 inch brook trout and 13-16 inch stocked (jumbo) rainbow trout throughout the summer.  A boat launch is available for non-motorized boats. A small campground offers 10 sites and serves both tent and RV campers. No reservations needed. 

Fishing Regulations: https://wdfw.wa.gov/publications/01914/wdfw01914.pdf 

From Naches, WA travel west on Highway 12 W for 4.4 miles. Turn left to stay on Highway 12 W and travel 33.7 miles. Turn right at Pacific Crest Trail access road and go 0.2 mile. Turn left onto Forest Road #498 and go 0.1 mile.