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Ed Adams
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1999 Rio Costilla Fly Fishing Report Archives
The Valle Vidal section of the Costilla opens on July 1st to facilitate elk calving in the park. Flows on the Costilla are regulated from Costlla Resevoir for irrigation downstream and unlike other irrigation impoundments they have a schedule of releases. High flows are Monday-Thursday and low flows from Friday-Sunday.. Flows between 30-100cfs are best but high flows have often been higher than 100cfs and low flows less than 30cfs.
July: The first half of July was excellent with Stonefly patterns {Stimulator #12}and on low flow days {Fri-Sun.} a dry only worked well and on high flow days {Mon.-Thurs.} we added a dropper {Caddis Larva or Pheasant Tail #16}. Later in July Caddis became the dominant bug especially later in the day. Flows were around 80cfs on high days and 40cfs on low weekends.
August: Because of easy access the Costlla gets lots of fishing pressure and by August the fish get picky. They tended to be wary of the large Stonefly patterns they saw so much of in July and tended to go for smaller bugs. PMD patterns {small yellow Mayfly #16} worked well over fussy fish and this hatch comes off in mid-morning. This is a good pattern to use for rising fish and others that have refused other offerings. There were lots of Hoppers around in the meadow sections and we fished Hopper-Dropper combos with good success this month..Later in the day Caddis dry also produced well. There is very little shade in this mostly meadow area and staying late to take advantage of low light conditions is a good idea. Flows were 60-80cfs Mon.-Thurs. but on weekends it dropped to 20cfs and with the weekend pressure fishing was tough.
September: Good releases continued thru the last week of the month and fishing pressure decreased. This year the Costilla fished well thru September which is rare as they normally cut flows when the irrigation season is over .
Rio Costilla Fly Fishing Reports
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New Mexico Fly Fishing Report Archives
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