Cougar Island is a backcountry campsite on Ross Lake accessible only by boat, offering primitive camping with fire rings, picnic tables, and some sites featuring bear boxes for food storage.

A permit is required through the North Cascades National Park Complex, and access is available via water taxi from Ross Lake Resort or Hozomeen; summer months (late June through early September) offer the best conditions, though sites can get busy during peak season.

Pack-out all waste and bring your own water or filtration system, as this is a remote wilderness destination with no potable water or garbage services.