claim: Weill Cornell Medicine is a biomedical textbook.
evidence: St. Vrain Creek -LRB- often known locally as the St. Vrain River -RRB- is a tributary of the South Platte River , approximately 32.2 mi long , in north central Colorado in the United States .. South Platte. South Platte River. Platte. Platte River. South Platte River. South Platte River. Colorado. Colorado. United States. United States. It drains part of the foothills north of Boulder and the Colorado Piedmont area in the vicinity of Longmont .. Colorado. Colorado. Boulder. Boulder, Colorado. Colorado Piedmont. Colorado Piedmont. Longmont. Longmont, Colorado. The creek is formed by the confluence of North and South St. Vrain creeks at Lyons .. Lyons. Lyons, Colorado. The creek rises in several branches in the foothills of the Front Range northwest of Boulder .. Boulder. Boulder, Colorado. Front Range. Front Range. Middle St. Vrain Creek rises along the continental divide , west of St. Vrain Mountain .. continental divide. continental divide. St. Vrain Mountain. St. Vrain Mountain. It descends in canyon to flow along State Highway 7 and past Raymond .. State Highway 7. Colorado State Highway 7. Raymond. Raymond, Colorado. It joins the shorter South St. Vrain Creek about two miles below Raymond .. Raymond. Raymond, Colorado. Parts of the South St. Vrain Creek form a five mile Class 5 + kayak run during normal flows .. North St. Vrain Creek rises northeast of St. Vrain Mountain near Allenspark and descends in a remote canyon to the east along U.S. Highway 36 .. St. Vrain Mountain. St. Vrain Mountain. Allenspark. Allenspark, Colorado. U.S. Highway 36. U.S. Highway 36 ( Colorado ). The two branches join at Lyons , at the mouth of the canyon .. Lyons. Lyons, Colorado. East of Lyons , the combined stream flows southeast through farmland and ranch country , passing south of Hygiene and entering Longmont .. Longmont. Longmont, Colorado. Lyons. Lyons, Colorado. Hygiene. Hygiene, Colorado. It passes through the south side of Longmont where it is rimmed by a greenway trail and several parks .. Longmont. Longmont, Colorado. East of Longmont it flows generally northeast , meandering through a wide river bottom in ranch country and passing under Interstate 25 south of the intersection with State Highway 66 .. Longmont. Longmont, Colorado. Interstate 25. Interstate 25 ( Colorado ). State Highway 66. Colorado State Highway 66. It joins the South Platte from the west just upstream from the ruins of Fort St. Vrain and approximately 4 miles -LRB- 6.4 km -RRB- northwest of Platteville .. South Platte. South Platte River. Platte. Platte River. Fort St. Vrain. Fort Saint Vrain. Platteville. Platteville, Colorado. St. Vrain Creek is joined by Left Hand Creek south of Longmont and Boulder Creek east of Longmont .. Boulder. Boulder, Colorado. Longmont. Longmont, Colorado. Left Hand Creek. Left Hand Creek ( Colorado ). Boulder Creek. Boulder Creek ( Colorado ). The stream was named after Ceran St. Vrain , a pioneer trader .. Ceran St. Vrain. Ceran St. Vrain