There isn't enough here to plan a trip around. No local fish records, no confirmed public access, and no guide coverage have turned up for Geddes Creek.
Wilmer Creek and
Goldie Creek, both nearby Columbia Valley creeks, carry a real rainbow trout, brook trout and kokanee record signal, and
Holland Creek has a strong warmwater, lake-edge forage signal near Windermere Lake, so all three are better starting points than Geddes if you want a Columbia Valley creek with confirmed fish. Before fishing Geddes Creek itself, confirm lower-channel access, a legal road crossing, actual fish presence and cool summer flow, since a creek this narrow, gentle and low-volume can run marginal by late summer.
If access, fish presence and flow are ever confirmed, small, sparse patterns suit a creek this size: an
Adams,
Royal Wulff,
Elk Hair Caddis, small
Stimulator,
Hare's Ear,
Prince Nymph and
Pheasant Tail. Likely food, if the creek does hold fish, would be
mayflies,
caddisflies, small
stoneflies, summer
terrestrials and, where the lower reach connects to bigger water,
baitfish and fry. None of this is confirmed on Geddes Creek itself.