| Alloperla delicata Frison, 1935 | Convoluted barbula moss |
| Alloperla elevata (Frison, 1935) | ⇒ Alloperla severa Hagen, 1861 |
| Alloperla fraterna Frison, 1935 | Cascades Sallfly |
| Amphinemura borealis Morton, 1894 | |
| Amphinemura standfussi Ris, 1902 | Small Brown |
| Amphinemura sulcicollis Stephens, 1836 | Small Brown |
| Arsapnia tumida Claassen, 1924 | Swollen Snowfly |
| Bisancora pastina Jewett, 1962 | Antelope Sallfly |
| Brachyptera risi Morton, 1896 | February Red |
| Calineuria californica Banks, 1905 | Western Stone |
| Calliperla luctuosa Banks, 1906 | Coast Stripetail |
| Capnia cheama Ricker, 1965 | Cheama Snowfly |
| Capnia coloradensis Claassen, 1937 | Colorado Snowfly |
| Capnia confusa Claassen, 1936 | Widespread Snowfly |
| Capnia elongata Claassen, 1924 | Cascades Snowfly |
| Capnia erecta Jewett, 1955 | Erect Snowfly |
| Capnia excavata Claassen, 1924 | Saddleback Snowfly |
| Capnia glabra Claassen, 1924 | Smooth Snowfly |
| Capnia gracilaria Claassen, 1924 | Slender Snowfly |
| Capnia jewetti Frison, 1942 | Spring Snowfly |
| Capnia kersti Nelson, 2004 | Eugene Snowfly |
| Capnia licina Jewett, 1954 | Bent Snowfly |
| Capnia melia Frison, 1942 | Northwest Snowfly |
| Capnia nana Claassen, 1924 | Dwarf Snowfly |
| Capnia nana nana Claassen, 1924 | |
| Capnia nana wasatchae Nebeker & Ga..., 1967 | |
| Capnia oregona Frison, 1942 | Oregon Snowfly |
| Capnia petila Jewett, 1954 | Thin Snowfly |
| Capnia promota Frison, 1937 | Pacific Snowfly |
| Capnia sextuberculata Jewett, 1954 | Six-knobbed Snowfly |
| Capnia umpqua Frison, 1942 | Umpqua Snowfly |
| Capnia vernalis Newport, 1848 | Belly Snowfly |
| Capnia willametta Jewett, 1955 | Willamette Snowfly |
| Capnopsis schilleri Rostock, 1892 | |
| Capnura anas Nelson & Bau..., 1987 | Duckhead Snowfly |
| Capnura elevata Frison, 1942 | Thicklimb Snowfly |
| Capnura intermontana Nelson & Bau..., 1987 | Intermountain Snowfly |
| Capnura venosa Banks, 1900 | Falcate Snowfly |
| Cascadoperla trictura Hoppe, 1938 | Cascades Stripetail |
| Chernokrilus misnomus Claassen, 1925 | Pacific Springfly |
| Claassenia sabulosa Banks, 1900 | Shortwing Stone |
| Cultus pilatus Frison, 1942 | Vedder Springfly |
| Cultus tostonus Ricker, 1952 | Toston Springfly |
| Despaxia augusta Banks, 1907 | Autumn Needlefly |
| Diura knowltoni (Frison, 1937) | ⇒ Isogenus knowltoni Frison, 1937 |
| Diura nanseni Kempny, 1900 | Arctic Springfly |
| Doddsia occidentalis Banks, 1900 | Western Willowfly |
| Doroneuria baumanni Stark & Gaufin, 1974 | Cascades Stone |
| Eucapnopsis brevicauda Claassen, 1924 | Short-tailed snowfly |
| Frisonia picticeps Hanson, 1942 | Painted Springfly |
| Gaufinia wallowa Stark & Baumann, 2021 | |
| Haploperla chilnualna Ricker, 1952 | Yosemite Sallfly |
| Hesperoperla pacifica Banks, 1900 | Golden Stone |
| Isocapnia abbreviata Frison, 1942 | Shortlimb Snowfly |
| Isocapnia agassizi Ricker, 1943 | Agassiz Snowfly |
| Isocapnia grandis Banks, 1907 | Giant Snowfly |
| Isocapnia hyalita Ricker, 1959 | Hyalite Snowfly |
| Isocapnia mogila Ricker, 1959 | Irregular Snowfly |
| Isocapnia palousa Zenger & Bau..., 2004 | Palouse Snowfly |
| Isocapnia rickeri Zenger & Bau..., 2004 | Umatilla Snowfly |
| Isocapnia spenceri Ricker, 1943 | Chilliwack Snowfly |
| Isogenoides colubrinus Hagen, 1874 | Blackfoot Springfly |
| Isoperla bifurcata Szczytko & S..., 1979 | Forked Stripetail |
| Isoperla difformis Klapálek, 1909 | |
| Isoperla fulva Claassen, 1937 | Western Stripetail |
| Isoperla fusca Needham & Cl..., 1925 | Swamp loosestrife |
| Isoperla grammatica (Poda, 1761) | ⇒ Isoperla luzoni Tierno de Fi..., 2005 |
| Isoperla gravitans Needham & Cl..., 1925 | Olympia Stripetail |
| Isoperla marmorata Needham & Cl..., 1925 | Red Stripetail |
| Isoperla mormona Banks, 1920 | Mormon Stripetail |
| Isoperla obscura Zetterstedt, 1840 | |
| Isoperla phalerata Needham, 1917 | Rockies Stripetail |
| Isoperla pinta Frison, 1937 | Checkered Stripetail |
| Isoperla quinquepunctata Banks, 1902 | Fivespot Stripetail |
| Isoperla rainiera (Jewett, 1954) | ⇒ Isoperla rainieri Jewett, 1954 |
| Isoperla roguensis Szczytko & S..., 1984 | Florida flatcoil |
| Isoperla sobria Hagen, 1874 | Colorado Stripetail |
| Isoperla sordida Banks, 1906 | Notched Stripetail |
| Isoperla tilasqua Szczytko & S..., 1979 | Oregon Stripetail |
| Isoperla umpqua Szczytko & S..., 2013 | |
| Kathroperla perdita Banks, 1920 | Longhead Sallfly |
| Kathroperla siskiyou Stark & Kond..., 2015 | Wagner Gap Sallfly |
| Kogotus nonus Needham & Cl..., 1925 | Smooth Springfly |
| Leuctra digitata Kempny, 1899 | |
| Leuctra fusca (Linnaeus, 1758) | ⇒ Leuctra picteti F. J. Pictet, 1856 |
| Leuctra hippopus Kempny, 1899 | Needle Fly |
| Leuctra nigra Olivier, 1811 | Needle Fly |
| Malenka bifurcata Claassen, 1923 | Forked Forestfly |
| Malenka californica Claassen, 1923 | California Forestfly |
| Malenka cornuta Claassen, 1923 | Horned Forestfly |
| Malenka depressa Banks, 1898 | Bluntlobe Forestfly |
| Malenka flexura Claassen, 1923 | Twisted Forestfly |
| Malenka perplexa Frison, 1936 | Coast Forestfly |
| Malenka tina Ricker, 1952 | Tiny Forestfly |
| Megaleuctra complicata Claassen, 1937 | Pacific Needlefly |
| Megaleuctra kincaidi Frison, 1942 | Cascades Needlefly |
| Megarcys subtruncata Hanson, 1942 | Truncate Springfly |
| Mesocapnia autumna Baumann & Ga..., 1970 | Autumn Snowfly |
| Mesocapnia lapwae Baumann & Ga..., 1970 | Lapwai Snowfly |
| Mesocapnia oenone Neave, 1929 | Wine Snowfly |
| Mesocapnia porrecta Jewett, 1954 | Stretched Snowfly |
| Mesocapnia projecta Frison, 1937 | Spined Snowfly |
| Mesocapnia yoloensis Baumann & Ga..., 1970 | Yolo Snowfly |
| Moselia infuscata Claassen, 1923 | Hairy Needlefly |
| Nemoura arctica Esben-Petersen, 1910 | Arctic Forestfly |
| Nemoura avicularis Morton, 1894 | |
| Nemoura cinerea (Retzius, 1783) | ⇒ Amphinemura sulcicollis Stephens, 1836 |
| Nemoura dubitans Morton, 1894 | |
| Nemoura erratica (Claassen, 1936) | ⇒ Nemoura flexuosa Aubert, 1949 |
| Nemoura flexuosa Aubert, 1949 | |
| Nemurella pictetii Klapálek, 1900 | Small Brown |
| Oemopteryx leei Baumann & Ko..., 2009 | Headwater Willowfly |
| Osobenus yakimae Hoppe, 1938 | Yakima Springfly |
| Ostrocerca dimicki Frison, 1936 | Hooked Forestfly |
| Ostrocerca foersteri Ricker, 1943 | Cascades Forestfly |
| Paracapnia disala Jewett, 1962 | Dirty Snowfly |
| Paracapnia ensicala Jewett, 1962 | Sword Snowfly |
| Paragnetina media Walker, 1852 | Embossed Stone |
| Paraleuctra forcipata Frison, 1937 | Bullshorn Needlefly |
| Paraleuctra occidentalis Banks, 1907 | Western Needlefly |
| Paraleuctra projecta Frison, 1942 | Rockies Needlefly |
| Paraleuctra vershina Gaufin & Ricker, 1974 | Summit Needlefly |
| Paraperla frontalis Banks, 1902 | Hyporheic Sallfly |
| Paraperla wilsoni Ricker, 1965 | Chilliwack Sallfly |
| Perlinodes aureus Smith, 1917 | Longgill Springfly |
| Perlomyia collaris Banks, 1906 | Black Needlefly |
| Perlomyia utahensis Needham & Cl..., 1925 | Swamp loosestrife |
| Plumiperla diversa Frison, 1935 | Margined Sallfly |
| Podmosta decepta Frison, 1942 | Least Forestfly |
| Podmosta delicatula Claassen, 1923 | Delicate Forestfly |
| Podmosta obscura Frison, 1936 | Brown-veined Forestfly |
| Pomoleuctra andersoni Harper & Wil..., 1985 | Oregon Needlefly |
| Pomoleuctra purcellana Neave, 1934 | Purcell Needlefly |
| Prostoia besametsa Ricker, 1952 | Banded Forestfly |
| Protonemura meyeri F.J. Pictet, 1841 | Early Brown |
| Pteronarcella badia Hagen, 1874 | Least Salmonfly |
| Pteronarcella regularis Hagen, 1874 | Dwarf Salmonfly |
| Pteronarcys californica Newport, 1848 | Giant Salmonfly |
| Pteronarcys princeps Banks, 1907 | Ebony Salmonfly |
| Rickera sorpta Needham & Cl..., 1925 | Palestripe Springfly |
| Setvena tibialis Banks, 1914 | Olympic Springfly |
| Setvena wahkeena Stewart & St..., 1985 | Wahkeena Springfly |
| Sierraperla cora Needham & Smith, 1916 | Giant Roachfly |
| Siphonoperla burmeisteri Pictet, 1841 | |
| Skwala americana Klapálek, 1912 | American Springfly |
| Skwala curvata Hanson, 1942 | Curved Springfly |
| Soliperla campanula Jewett, 1954 | Hood Roachfly |
| Soliperla quadrispinula Jewett, 1954 | Four-spined Roachfly |
| Soliperla tillamook Stark, 1983 | Tillamook Roachfly |
| Soyedina interrupta Claassen, 1923 | Broken Forestfly |
| Soyedina producta Claassen, 1923 | Knobbed Forestfly |
| Suwallia autumna Hoppe, 1938 | Autumn Sallfly |
| Suwallia dubia Frison, 1935 | Pale Sallfly |
| Suwallia lineosa Banks, 1918 | Lined Sallfly |
| Suwallia pallidula Banks, 1904 | Yellow Sallfly |
| Suwallia starki Alexander & ..., 1999 | Gallatin Sallfly |
| Sweltsa adamantea Surdick, 1995 | Washington Sallfly |
| Sweltsa borealis Banks, 1895 | Boreal Sallfly |
| Sweltsa coloradensis Banks, 1898 | Colorado Sallfly |
| Sweltsa exquisita Frison, 1935 | Exquisite Sallfly |
| Sweltsa fidelis Banks, 1920 | Mountain Sallfly |
| Sweltsa occidens Frison, 1937 | Alpine Sallfly |
| Sweltsa oregonensis Frison, 1935 | Oregon Sallfly |
| Sweltsa pacifica Banks, 1895 | Pacific Sallfly |
| Sweltsa revelstoka Jewett, 1955 | Canadian Sallfly |
| Taenionema jewetti Stanger & Ba..., 1993 | Columbia Willowfly |
| Taenionema kincaidi Hoppe, 1938 | Pale Willowfly |
| Taenionema oregonense Needham & Cl..., 1925 | Oregon Willowfly |
| Taenionema pacificum Banks, 1900 | Pacific Willowfly |
| Taenionema pallidum Banks, 1902 | Common Willowfly |
| Taenionema uinta Stanger & Ba..., 1993 | Uinta Willowfly |
| Taenionema umatilla Stanger & Ba..., 1993 | Umatilla Willowfly |
| Taeniopteryx nebulosa Linnaeus, 1758 | Early Black |
| Taeniopteryx nivalis Fitch, 1847 | Boreal Willowfly |
| Triznaka pintada Ricker, 1952 | Rough Sallfly |
| Triznaka signata Banks, 1895 | Striped Sallfly |
| Utacapnia columbiana Claassen, 1924 | Columbian Snowfly |
| Utacapnia imbera Nebeker & Ga..., 1965 | Scappoose Snowfly |
| Visoka cataractae Neave, 1933 | Cataract Forestfly |
| Yoraperla brevis Banks, 1907 | Least Roachfly |
| Yoraperla mariana Ricker, 1943 | Brown Roachfly |
| Yoraperla nigrisoma Banks, 1948 | Black Roachfly |
| Yoraperla siletz Stark & Nelson, 1994 | Coastal Roachfly |
| Zapada cinctipes Banks, 1897 | Common Forestfly |
| Zapada columbiana Claassen, 1923 | Columbian Forestfly |
| Zapada cordillera Baumann & Ga..., 1971 | Cordilleran Forestfly |
| Zapada frigida Claassen, 1923 | Frigid Forestfly |
| Zapada haysi Ricker, 1952 | Intermountain Forestfly |
| Zapada oregonensis Claassen, 1923 | Oregon Forestfly |
| Zwicknia bifrons Newman, 1838 | |
