<!-- Begin
document.write('<OPTION VALUE="ach">Achibueno</OPTION>');
document.write('<OPTION VALUE="acmx">Actopan River, Mexico</OPTION>');
document.write('<OPTION VALUE="agcr">Agujitas River, Costa Rica</OPTION>');
document.write('<OPTION VALUE="alag">Alagnak River, Alaska</OPTION>');
document.write('<OPTION VALUE="all">Allagash River, Maine</OPTION>');
document.write('<OPTION VALUE="alsk">Alsek River, Alaska</OPTION>');
document.write('<OPTION VALUE="amz">Amazon River, Peru</OPTION>');
document.write('<OPTION VALUE="aml">American River (Lower), California</OPTION>');
document.write('<OPTION VALUE="amm">American River (Middle Fork), California</OPTION>');
document.write('<OPTION VALUE="amn">American River (North Fork), California</OPTION>');
document.write('<OPTION VALUE="ams">American River (South Fork), California</OPTION>');
document.write('<OPTION VALUE="an">Animas River, Colorado</OPTION>');
document.write('<OPTION VALUE="ant">Antigua River, Mexico</OPTION>');
document.write('<OPTION VALUE="apr">Apurimac River, Peru</OPTION>');
document.write('<OPTION VALUE="ar">Arkansas River, Colorado</OPTION>');
document.write('<OPTION VALUE="bel">Belize River, Belize</OPTION>');
document.write('<OPTION VALUE="bsf">Big South Fork River, Kentucky</OPTION>');
document.write('<OPTION VALUE="bio">Bio Bio River, Chile</OPTION>');
document.write('<OPTION VALUE="blf">Black Fork,Ohio</OPTION>');
document.write('<OPTION VALUE="blk">Black River, New York</OPTION>');
document.write('<OPTION VALUE="blan">Blanco River, Ecuador</OPTION>');
document.write('<OPTION VALUE="bru">Bruneau River, Idaho</OPTION>');
document.write('<OPTION VALUE="cac">Cache La Poudre River, Colorado</OPTION>');
document.write('<OPTION VALUE="crsn">Carson River, California</OPTION>');
document.write('<OPTION VALUE="cbb">Caves Branch River, Belize</OPTION>');
document.write('<OPTION VALUE="chag">Chagres River, Panama</OPTION>');
document.write('<OPTION VALUE="char">Charley River, Alaska</OPTION>');
document.write('<OPTION VALUE="cha">Chattooga River, Georgia</OPTION>');
document.write('<OPTION VALUE="chas">Chattooga River, South Carolina</OPTION>');
document.write('<OPTION VALUE="cheak">Cheakamus River, BC</OPTION>');
document.write('<OPTION VALUE="ccc">Cherry Creek, California</OPTION>');
document.write('<OPTION VALUE="che">Chester River, (Maryland)</OPTION>');
document.write('<OPTION VALUE="chil">Chilcotin River, Canada</OPTION>');
document.write('<OPTION VALUE="chik">Chilkadrotna River</OPTION>');
document.write('<OPTION VALUE="chi">Chilko River, BC</OPTION>');
document.write('<OPTION VALUE="chipa">Chiriqui River, Panama</OPTION>');
document.write('<OPTION VALUE="chir">Chiriqui River, Panama</OPTION>');
document.write('<OPTION VALUE="cht">Chitina River, Alaska</OPTION>');
document.write('<OPTION VALUE="cfr">Clark Fork River, Montana</OPTION>');
document.write('<OPTION VALUE="cl">Claro</OPTION>');
document.write('<OPTION VALUE="clea">Clear Creek, Colorado</OPTION>');
document.write('<OPTION VALUE="cle">Clear Fork, Ohio</OPTION>');
document.write('<OPTION VALUE="col">Colca River, Peru</OPTION>');
document.write('<OPTION VALUE="cogc">Colorado River (Grand Canyon), Arizona</OPTION>');
document.write('<OPTION VALUE="coaz">Colorado River, Arizona</OPTION>');
document.write('<OPTION VALUE="co">Colorado River, Colorado</OPTION>');
document.write('<OPTION VALUE="cou">Colorado River, Utah</OPTION>');
document.write('<OPTION VALUE="cop">Copper River, Alaska</OPTION>');
document.write('<OPTION VALUE="cor">Coruh River (Turkey)</OPTION>');
document.write('<OPTION VALUE="cot">Cotahuasi River, Peru</OPTION>');
document.write('<OPTION VALUE="clr">Cumberland River, Kentucky</OPTION>');
document.write('<OPTION VALUE="dea">Dead River, Maine</OPTION>');
document.write('<OPTION VALUE="dee">Deerfield River, Massachusetts</OPTION>');
document.write('<OPTION VALUE="del">Delaware River, New Jersey</OPTION>');
document.write('<OPTION VALUE="deln">Delaware River, New York</OPTION>');
document.write('<OPTION VALUE="dr">Deschutes River, Oregon</OPTION>');
document.write('<OPTION VALUE="dol">Dolores River, Colorado</OPTION>');
document.write('<OPTION VALUE="drif">Driftwood River, Indiana</OPTION>');
document.write('<OPTION VALUE="edi">Edisto River, South Carolina</OPTION>');
document.write('<OPTION VALUE="eel">Eel River, California</OPTION>');
document.write('<OPTION VALUE="ela">Elaho River, BC</OPTION>');
document.write('<OPTION VALUE="elw">Elwha River, Washington</OPTION>');
document.write('<OPTION VALUE="frc">Feather River, California</OPTION>');
document.write('<OPTION VALUE="filo">Filobobos River, Mexico</OPTION>');
document.write('<OPTION VALUE="flam">Flathead River (Middle Fork), Montana</OPTION>');
document.write('<OPTION VALUE="fla">Flathead River, Montana</OPTION>');
document.write('<OPTION VALUE="fra">Fraser River, BC</OPTION>');
document.write('<OPTION VALUE="fb">French Broad River, North Carolina</OPTION>');
document.write('<OPTION VALUE="fut">Futaleufu River, Chile</OPTION>');
document.write('<OPTION VALUE="ga">Gauley River, West Virginia</OPTION>');
document.write('<OPTION VALUE="gi">Gila River, Arizona</OPTION>');
document.write('<OPTION VALUE="grc">Green River, Colorado</OPTION>');
document.write('<OPTION VALUE="grer">Green River, Utah</OPTION>');
document.write('<OPTION VALUE="gu">Gunnison River, Colorado</OPTION>');
document.write('<OPTION VALUE="hap">Happy River, Alaska</OPTION>');
document.write('<OPTION VALUE="hiw">Hiwassee River, Tennessee</OPTION>');
document.write('<OPTION VALUE="huo">Housatonic River, Connecticut</OPTION>');
document.write('<OPTION VALUE="hug">Hudson River, New York</OPTION>');
document.write('<OPTION VALUE="hula">Hulahula River, Alaska</OPTION>');
document.write('<OPTION VALUE="hur">Huron River, Michigan</OPTION>');
document.write('<OPTION VALUE="ill">Illinois River, Oregon</OPTION>');
document.write('<OPTION VALUE="john">John Day River, Oregon</OPTION>');
document.write('<OPTION VALUE="kana">Kananaskis River (Alberta Canada)</OPTION>');
document.write('<OPTION VALUE="kaw">Kaweah River, California</OPTION>');
document.write('<OPTION VALUE="ken">Kennebec River, Maine</OPTION>');
document.write('<OPTION VALUE="kenn">Kennicott River, Alaska</OPTION>');
document.write('<OPTION VALUE="kn">Kern River, California</OPTION>');
document.write('<OPTION VALUE="kick">Kicking Horse River, Canada</OPTION>');
document.write('<OPTION VALUE="king">King Salmon River, Alaska</OPTION>');
document.write('<OPTION VALUE="kin">Kings River, California</OPTION>');
document.write('<OPTION VALUE="klw">Klamath River (Lower), California</OPTION>');
document.write('<OPTION VALUE="ka">Klamath River (Upper), Oregon</OPTION>');
document.write('<OPTION VALUE="kok">Kokosing, Ohio</OPTION>');
document.write('<OPTION VALUE="kokt">Koktuli River, Alaska</OPTION>');
document.write('<OPTION VALUE="ko">Kongakut River, Alaska</OPTION>');
document.write('<OPTION VALUE="lak">Lake Fork, Ohio</OPTION>');
document.write('<OPTION VALUE="lam">Lamoille River, Vermont</OPTION>');
document.write('<OPTION VALUE="le">Lehigh River, Pennsylvania</OPTION>');
document.write('<OPTION VALUE="loch">Lochsa River, Idaho</OPTION>');
document.write('<OPTION VALUE="lt">Lontue</OPTION>');
document.write('<OPTION VALUE="mac">Macal River, Belize</OPTION>');
document.write('<OPTION VALUE="man">Manzo River, Chile</OPTION>');
document.write('<OPTION VALUE="mar">Maryland River (Maryland)</OPTION>');
document.write('<OPTION VALUE="mat">Matanuska River, Alaska</OPTION>');
document.write('<OPTION VALUE="mck">McKenzie River, Oregon</OPTION>');
document.write('<OPTION VALUE="mek">Mekong River (China)</OPTION>');
document.write('<OPTION VALUE="men">Menominee River, Wisconsin</OPTION>');
document.write('<OPTION VALUE="me">Merced River, California</OPTION>');
document.write('<OPTION VALUE="mil">Miller\'s River, Massachusetts</OPTION>');
document.write('<OPTION VALUE="miss">Missahualli, Ecuador</OPTION>');
document.write('<OPTION VALUE="mis">Missouri River, Montana</OPTION>');
document.write('<OPTION VALUE="moh">Mohican River, Ohio</OPTION>');
document.write('<OPTION VALUE="moho">Moho River, Belize</OPTION>');
document.write('<OPTION VALUE="moo">Moose River, New York</OPTION>');
document.write('<OPTION VALUE="mob">Mopan River, Belize</OPTION>');
document.write('<OPTION VALUE="my">Moyie River, Idaho</OPTION>');
document.write('<OPTION VALUE="mulc">Mulchatna River, Alaska</OPTION>');
document.write('<OPTION VALUE="mus">Muskingum River, Ohio</OPTION>');
document.write('<OPTION VALUE="nac">Nahatlatch Canyon, BC</OPTION>');
document.write('<OPTION VALUE="nah">Nahatlatch River, BC</OPTION>');
document.write('<OPTION VALUE="na">Nantahala River, North Carolina</OPTION>');
document.write('<OPTION VALUE="nap">Napo River, Ecuador</OPTION>');
document.write('<OPTION VALUE="nen">Nenana River, Alaska</OPTION>');
document.write('<OPTION VALUE="newb">New River, Belize</OPTION>');
document.write('<OPTION VALUE="nri">New River, North Carolina</OPTION>');
document.write('<OPTION VALUE="ne">New River, West Virginia</OPTION>');
document.write('<OPTION VALUE="niz">Nizina River, Alaska</OPTION>');
document.write('<OPTION VALUE="nol">Nolichucky River, North Carolina</OPTION>');
document.write('<OPTION VALUE="np">North Platte River, Colorado</OPTION>');
document.write('<OPTION VALUE="npw">North Platte River, Wyoming</OPTION>');
document.write('<OPTION VALUE="nb">Nuble</OPTION>');
document.write('<OPTION VALUE="oc">Ocoee River, Tennessee</OPTION>');
document.write('<OPTION VALUE="ori">Orinoco River, Venezuela</OPTION>');
document.write('<OPTION VALUE="ow">Owyhee River, Idaho</OPTION>');
document.write('<OPTION VALUE="pac">Pacuare River, Costa Rica</OPTION>');
document.write('<OPTION VALUE="pas">Pascua River, Costa Rica</OPTION>');
document.write('<OPTION VALUE="past">Pastaza, Ecuador</OPTION>');
document.write('<OPTION VALUE="pay">Payette River, Idaho</OPTION>');
document.write('<OPTION VALUE="peji">Pejibaye River, Costa Rica</OPTION>');
document.write('<OPTION VALUE="pen">Penobscot River, Maine</OPTION>');
document.write('<OPTION VALUE="pes">Peshtigo River, Wisconsin</OPTION>');
document.write('<OPTION VALUE="petr">Petrohue River, Chile</OPTION>');
document.write('<OPTION VALUE="pie">Piedra River, Colorado</OPTION>');
document.write('<OPTION VALUE="pi">Pigeon River, Tennessee</OPTION>');
document.write('<OPTION VALUE="pot">Potomac River, Maryland</OPTION>');
document.write('<OPTION VALUE="revcr">Reventazon River, Costa Rica</OPTION>');
document.write('<OPTION VALUE="rt">Reventazon River, Costa Rica</OPTION>');
document.write('<OPTION VALUE="rac">Rio Actopan (Veracruz), Mexico</OPTION>');
document.write('<OPTION VALUE="ra">Rio Antigua (Veracruz), Mexico</OPTION>');
document.write('<OPTION VALUE="rcr">Rio Cahabon (Guatamala)</OPTION>');
document.write('<OPTION VALUE="rc">Rio Chama, New Mexico</OPTION>');
document.write('<OPTION VALUE="rf">Rio Filobobos (Veracruz), Mexico</OPTION>');
document.write('<OPTION VALUE="rg">Rio Grande, New Mexico</OPTION>');
document.write('<OPTION VALUE="rgt">Rio Grande, Texas</OPTION>');
document.write('<OPTION VALUE="riop">Rio Pacuare, Costa Rica</OPTION>');
document.write('<OPTION VALUE="rpe">Rio Pejibaye, Costa Rica</OPTION>');
document.write('<OPTION VALUE="rp">Rio Pescados (Veracruz), Mexico</OPTION>');
document.write('<OPTION VALUE="rsm">Rio Santa Maria (San Luis Potosi), Mexico</OPTION>');
document.write('<OPTION VALUE="riov">Rio Verde, Arizona</OPTION>');
document.write('<OPTION VALUE="roar">Roaring Fork River, Colorado</OPTION>');
document.write('<OPTION VALUE="ro">Rogue River, Oregon</OPTION>');
document.write('<OPTION VALUE="rfr">Russell Fork River, Kentucky</OPTION>');
document.write('<OPTION VALUE="rus">Russian River, California</OPTION>');
document.write('<OPTION VALUE="saca">Sacandaga River, New York</OPTION>');
document.write('<OPTION VALUE="sac">Sacramento River, California</OPTION>');
document.write('<OPTION VALUE="sajn">Saint John River, Maine</OPTION>');
document.write('<OPTION VALUE="los">Salmon River (Lower), Idaho</OPTION>');
document.write('<OPTION VALUE="srm">Salmon River (Main), Idaho</OPTION>');
document.write('<OPTION VALUE="mfs">Salmon River (Middle Fork), Idaho</OPTION>');
document.write('<OPTION VALUE="salc">Salmon River, California</OPTION>');
document.write('<OPTION VALUE="sal">Salmon River, Idaho</OPTION>');
document.write('<OPTION VALUE="sl">Salt River, Arizona</OPTION>');
document.write('<OPTION VALUE="sj">San Juan River, Arizona</OPTION>');
document.write('<OPTION VALUE="sjc">San Juan River, Colorado</OPTION>');
document.write('<OPTION VALUE="sju">San Juan River, Utah</OPTION>');
document.write('<OPTION VALUE="smg">San Miguel River, Colorado</OPTION>');
document.write('<OPTION VALUE="sama">Santa Maria River, Mexico</OPTION>');
document.write('<OPTION VALUE="sar">Sarapiqui River, Costa Rica</OPTION>');
document.write('<OPTION VALUE="sco">Scott River, California</OPTION>');
document.write('<OPTION VALUE="sel">Selway River, Idaho</OPTION>');
document.write('<OPTION VALUE="she">Shenandoah River, Virginia</OPTION>');
document.write('<OPTION VALUE="sher">Sheridan Glacier River, Alaska</OPTION>');
document.write('<OPTION VALUE="sib">Sibun River, Belize</OPTION>');
document.write('<OPTION VALUE="skyk">Skykomish River, Washington</OPTION>');
document.write('<OPTION VALUE="smi">Smith River, California</OPTION>');
document.write('<OPTION VALUE="snhc">Snake River (Hell\'s Canyon), Idaho</OPTION>');
document.write('<OPTION VALUE="sr">Snake River, Idaho</OPTION>');
document.write('<OPTION VALUE="snw">Snake River, Wyoming</OPTION>');
document.write('<OPTION VALUE="ska">South Kawishiwi River, Minnesota</OPTION>');
document.write('<OPTION VALUE="ssc">South Stann Creek River, Belize</OPTION>');
document.write('<OPTION VALUE="sjr">St. Joe River, Idaho</OPTION>');
document.write('<OPTION VALUE="st">Stanislaus River, California</OPTION>');
document.write('<OPTION VALUE="ste">Stein River, BC</OPTION>');
document.write('<OPTION VALUE="tal">Talkeetna River, Alaska</OPTION>');
document.write('<OPTION VALUE="tam">Tambopata River, Peru</OPTION>');
document.write('<OPTION VALUE="tana">Tana River, Alaska</OPTION>');
document.write('<OPTION VALUE="tae">Taseko River, BC</OPTION>');
document.write('<OPTION VALUE="tasn">Tasnuna River, Alaska</OPTION>');
document.write('<OPTION VALUE="tatr">Tatshenshini River, Alaska</OPTION>');
document.write('<OPTION VALUE="tn">Teno</OPTION>');
document.write('<OPTION VALUE="tho">Thompson River, BC</OPTION>');
document.write('<OPTION VALUE="tli">Tlikikila River, Alaska</OPTION>');
document.write('<OPTION VALUE="toa">Toachi River, Ecuador</OPTION>');
document.write('<OPTION VALUE="toc">Toccoa, Georgia</OPTION>');
document.write('<OPTION VALUE="tr">Trinity River, California</OPTION>');
document.write('<OPTION VALUE="trc">Truckee River, California</OPTION>');
document.write('<OPTION VALUE="tsi">Tsaina River, Alaska</OPTION>');
document.write('<OPTION VALUE="tuic">Tuichi River, Bolivia</OPTION>');
document.write('<OPTION VALUE="tull">Tully River, Australia</OPTION>');
document.write('<OPTION VALUE="tu">Tuolumne River, California</OPTION>');
document.write('<OPTION VALUE="tus">Tuscarawas River, Ohio</OPTION>');
document.write('<OPTION VALUE="um">Umpqua River, Oregon</OPTION>');
document.write('<OPTION VALUE="uru">Urubama River, Peru</OPTION>');
document.write('<OPTION VALUE="urub">Urubamba River, Bolivia</OPTION>');
document.write('<OPTION VALUE="usu">Usumacinta River, Mexico</OPTION>');
document.write('<OPTION VALUE="vg">Valle Grande</OPTION>');
document.write('<OPTION VALUE="ver">Verde River, Arizona</OPTION>');
document.write('<OPTION VALUE="vilc">Vilcanota River, Peru</OPTION>');
document.write('<OPTION VALUE="wall">Wallowa-Grande Ronde River, Idaho</OPTION>');
document.write('<OPTION VALUE="wat">Watauga River, North Carolina</OPTION>');
document.write('<OPTION VALUE="watt">Watauga River, Tennessee</OPTION>');
document.write('<OPTION VALUE="wst">West River, Vermont</OPTION>');
document.write('<OPTION VALUE="whi">White River, Utah</OPTION>');
document.write('<OPTION VALUE="ws">White Salmon River, Washington</OPTION>');
document.write('<OPTION VALUE="win">Wind River, Oregon</OPTION>');
document.write('<OPTION VALUE="wye">Wye River (Maryland)</OPTION>');
document.write('<OPTION VALUE="ya">Yampa River, Colorado</OPTION>');
document.write('<OPTION VALUE="yau">Yampa River, Utah</OPTION>');
document.write('<OPTION VALUE="yan">Yangtze River, China</OPTION>');
document.write('<OPTION VALUE="yaq">Yaque Norte River, Dominican Republic</OPTION>');
document.write('<OPTION VALUE="ysm">Yellowstone River,  Montana</OPTION>');
document.write('<OPTION VALUE="yel">Yellowstone River, Montana</OPTION>');
document.write('<OPTION VALUE="ynf">Yuba River (North Fork), California</OPTION>');
document.write('<OPTION VALUE="zam">Zambezi River, Zambia</OPTION>');
document.write('<OPTION VALUE="zamb">Zambezi River, Zambia</OPTION>');
document.write('<OPTION VALUE="zan">Zanskar River (India)</OPTION>');

