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Main Menu > Rocky Mountain National Park > Also Nearby Arapaho National Wildlife Refuge Walden, Colorado This Excursion Comes From ... National Geographic's Guide to the Lewis and Clark Trail For more National Geographic travel guides—from Europe to Antarctica and everywhere in between—visit National Geographic Books >> Set in a glacial basin ringed by mountains, Arapaho offers carefully maintained irrigated meadows that provide essential nesting habitat for waterfowl such as gadwall, lesser scaup, mallard, and wigeon. Black-crowned night herons breed along the Illinois River and sage grouse winter in upland hills. Features 6-mile-long [9.7-kilometer-long] self-guided auto tour (sometimes closed in winter due to snow). 23,267 acres [9,415.8 hectares]. Facilities include fishing, hunting, scenic drives. Open year-round, dawn to dusk. Headquarters on Colorado Hwy. 125 south of Walden, about 50 miles [81 kilometers] from Rocky Mountain NP. +1 970 723 8202. More Recommendations for Rocky Mountain National Park