-Eagle River Valley: start at the ERNC, hike up to Icicle Creek, cross Eagle River, backtrack a bit and head uphill on the northern side of Heritage Falls. A mean bushwack leads into the Organ Glacier Valley, and eventually a terminus of the Organ Glacier.
-South Fork Eagle River Valley: start at the SF trailhead and head to the Flute Glacier. Just before the Flute's terminus, head uphill into the rocky cirque on the south side of Eagle Peak. From the cirque, gain a grassy ridge that overlooks the Flute Glacier and head uphill onto the Flute/Eagle ridge. From several places along that ridge, a few routes lead down towards the glacier (not confirmed, only spotted).