Run-off waters are receding, but have a way to go yet on many streams. The Firehole is fishing quite well with PMD and caddis life cycle patterns producing. One of the best patterns to use here is a partridge and olive or partridge and orange soft hackle, size 12-16. These are great emerger patterns for caddisflies and mayflies. Be sure to have some in that fly box! White miller emerger patterns will also work well. Also be aware of new closures to protect thermal features along the river. Shoshone and Lewis Lakes are in good fishing shape, but be aware that trails are in soggy conditions with some snow remaining. Best fishing on both will be from boats and when streamer and leech patterns are presented. Duck Creek is fishing well or nice rainbows. The meadow is wet and mosquitoes are out in good numbers as is the case in just about anywhere in the park.