There are at least 101 named lakes and reservoirs in Monroe County, Arkansas.
Lakes
edit- Barnes Lake, 34°52′46″N 091°21′03″W / 34.87944°N 91.35083°W, el. 164 feet (50 m) [1]
- Bear Slough, 34°38′33″N 091°17′56″W / 34.64250°N 91.29889°W, el. 157 feet (48 m) [2]
- Beaver Dam Lake, 34°28′42″N 091°11′30″W / 34.47833°N 91.19167°W, el. 151 feet (46 m) [3]
- Bellknap Lake, 34°22′43″N 091°06′34″W / 34.37861°N 91.10944°W, el. 151 feet (46 m) [4]
- Big Baptize Lake, 34°38′47″N 091°17′00″W / 34.64639°N 91.28333°W, el. 157 feet (48 m) [5]
- Big Cotton Lake, 34°59′25″N 091°12′23″W / 34.99028°N 91.20639°W, el. 174 feet (53 m) [6]
- Big Eagle Lake, 34°32′53″N 091°16′43″W / 34.54806°N 91.27861°W, el. 157 feet (48 m) [7]
- Big Weidmann Lake, 34°42′44″N 091°20′06″W / 34.71222°N 91.33500°W, el. 154 feet (47 m) [8]
- Blue Hole, 34°57′16″N 091°12′34″W / 34.95444°N 91.20944°W, el. 174 feet (53 m) [9]
- Boggy Lake, 34°32′11″N 091°16′48″W / 34.53639°N 91.28000°W, el. 161 feet (49 m) [10]
- Browns Shanty Lake, 34°27′01″N 091°10′07″W / 34.45028°N 91.16861°W, el. 151 feet (46 m) [11]
- Brushy Lake, 34°40′08″N 091°17′48″W / 34.66889°N 91.29667°W, el. 157 feet (48 m) [12]
- Brushy Lake, 34°26′00″N 091°07′35″W / 34.43333°N 91.12639°W, el. 144 feet (44 m) [13]
- Brushy Lake, 34°30′47″N 091°15′00″W / 34.51306°N 91.25000°W, el. 151 feet (46 m) [14]
- Buck Lake, 34°23′46″N 091°07′08″W / 34.39611°N 91.11889°W, el. 148 feet (45 m) [15]
- Bull Lake, 34°53′49″N 091°21′40″W / 34.89694°N 91.36111°W, el. 171 feet (52 m) [16]
- Burnt Cypress Lake, 34°31′46″N 091°15′12″W / 34.52944°N 91.25333°W, el. 154 feet (47 m) [17]
- Clear Lake, 34°36′59″N 091°19′02″W / 34.61639°N 91.31722°W, el. 161 feet (49 m) [18]
- Cloud Lake, 34°34′02″N 091°18′14″W / 34.56722°N 91.30389°W, el. 154 feet (47 m) [19]
- Cooter Lake, 34°31′04″N 091°12′16″W / 34.51778°N 91.20444°W, el. 154 feet (47 m) [20]
- Crab Lake, 34°29′25″N 091°11′14″W / 34.49028°N 91.18722°W, el. 148 feet (45 m) [21]
- Crosspond Bayou, 34°51′19″N 091°20′01″W / 34.85528°N 91.33361°W, el. 164 feet (50 m) [22]
- Crowfoot Lake, 34°23′50″N 091°06′46″W / 34.39722°N 91.11278°W, el. 151 feet (46 m) [23]
- Dodson Lake, 34°56′43″N 091°13′38″W / 34.94528°N 91.22722°W, el. 171 feet (52 m) [24]
- Eagle Nest Lake, 34°34′03″N 091°16′45″W / 34.56750°N 91.27917°W, el. 154 feet (47 m) [25]
- Eagle Nest Lake, 34°22′42″N 091°05′03″W / 34.37833°N 91.08417°W, el. 148 feet (45 m) [26]
- East Lake, 34°36′04″N 091°17′07″W / 34.60111°N 91.28528°W, el. 154 feet (47 m) [27]
- First Old River, 34°40′41″N 091°19′33″W / 34.67806°N 91.32583°W, el. 151 feet (46 m) [28]
- Fish Lake, 34°46′50″N 091°19′07″W / 34.78056°N 91.31861°W, el. 164 feet (50 m) [29]
- Forked Lake, 34°34′43″N 091°16′30″W / 34.57861°N 91.27500°W, el. 154 feet (47 m) [30]
- Goose Lake, 34°27′21″N 091°11′17″W / 34.45583°N 91.18806°W, el. 154 feet (47 m) [31]
- Goose Lake, 34°46′38″N 091°21′53″W / 34.77722°N 91.36472°W, el. 164 feet (50 m) [32]
- Goose Lake, 34°24′49″N 091°06′54″W / 34.41361°N 91.11500°W, el. 151 feet (46 m) [33]
- Goose Lake, 34°36′40″N 091°16′45″W / 34.61111°N 91.27917°W, el. 161 feet (49 m) [34]
- Goose Pond, 34°35′36″N 091°16′55″W / 34.59333°N 91.28194°W, el. 157 feet (48 m) [35]
- Graveyard Lake, 34°37′10″N 091°20′52″W / 34.61944°N 91.34778°W, el. 161 feet (49 m) [36]
- Green Lake, 34°34′03″N 091°15′24″W / 34.56750°N 91.25667°W, el. 154 feet (47 m) [37]
- Hart Lake, 34°40′22″N 091°22′02″W / 34.67278°N 91.36722°W, el. 161 feet (49 m) [38]
- Heifer Lake, 34°54′20″N 091°20′44″W / 34.90556°N 91.34556°W, el. 171 feet (52 m) [39]
- Hickson Lake, 34°53′20″N 091°17′49″W / 34.88889°N 91.29694°W, el. 167 feet (51 m) [40]
- Hog Thief Lake, 34°24′45″N 091°06′15″W / 34.41250°N 91.10417°W, el. 144 feet (44 m) [41]
- Hole in the Wall, 34°43′26″N 091°19′13″W / 34.72389°N 91.32028°W, el. 154 feet (47 m) [42]
- Horseshoe Lake, 34°37′09″N 091°17′17″W / 34.61917°N 91.28806°W, el. 154 feet (47 m) [43]
- Horseshoe Lake, 34°28′06″N 091°12′18″W / 34.46833°N 91.20500°W, el. 157 feet (48 m) [44]
- Horseshoe Lake, 34°46′36″N 091°19′52″W / 34.77667°N 91.33111°W, el. 164 feet (50 m) [45]
- Ingram Lake, 34°45′58″N 091°18′15″W / 34.76611°N 91.30417°W, el. 161 feet (49 m) [46]
- Kansas Lake, 34°28′16″N 091°09′13″W / 34.47111°N 91.15361°W, el. 148 feet (45 m) [47]
- Lambert Bayou, 34°25′43″N 091°08′18″W / 34.42861°N 91.13833°W, el. 151 feet (46 m) [48]
- Little Baptize Lake, 34°38′35″N 091°16′53″W / 34.64306°N 91.28139°W, el. 161 feet (49 m) [49]
- Little Cotton Lake, 34°59′31″N 091°12′15″W / 34.99194°N 91.20417°W, el. 174 feet (53 m) [50]
- Little Eagle Lake, 34°33′14″N 091°16′50″W / 34.55389°N 91.28056°W, el. 161 feet (49 m) [51]
- Little Long Lake, 34°22′14″N 091°04′58″W / 34.37056°N 91.08278°W, el. 144 feet (44 m) [52]
- Little Moon Lake, 34°23′35″N 091°07′22″W / 34.39306°N 91.12278°W, el. 144 feet (44 m) [53]
- Little Weidmann Lake, 34°42′28″N 091°19′58″W / 34.70778°N 91.33278°W, el. 161 feet (49 m) [54]
- Long Lake, 34°24′34″N 091°08′47″W / 34.40944°N 91.14639°W, el. 151 feet (46 m) [55]
- Long Lake, 34°45′12″N 091°19′09″W / 34.75333°N 91.31917°W, el. 157 feet (48 m) [56]
- Long Lake, 34°54′47″N 091°20′22″W / 34.91306°N 91.33944°W, el. 171 feet (52 m) [57]
- Lost Lake, 34°48′37″N 091°20′09″W / 34.81028°N 91.33583°W, el. 164 feet (50 m) [58]
- Lower Crooked Lake, 34°32′49″N 091°15′19″W / 34.54694°N 91.25528°W, el. 144 feet (44 m) [59]
- Lower Eagle Nest Lake, 34°28′32″N 091°10′06″W / 34.47556°N 91.16833°W, el. 151 feet (46 m) [60]
- Lower Forked Lake, 34°28′04″N 091°11′30″W / 34.46778°N 91.19167°W, el. 154 feet (47 m) [61]
- Middle Crooked Lake, 34°33′19″N 091°15′39″W / 34.55528°N 91.26083°W, el. 144 feet (44 m) [62]
- Middle Old River, 34°42′50″N 091°20′43″W / 34.71389°N 91.34528°W, el. 151 feet (46 m) [63]
- Mill Lake, 34°58′23″N 091°12′03″W / 34.97306°N 91.20083°W, el. 177 feet (54 m) [64]
- Moon Lake, 34°21′53″N 091°05′08″W / 34.36472°N 91.08556°W, el. 141 feet (43 m) [65]
- Mud Lake, 34°36′53″N 091°18′43″W / 34.61472°N 91.31194°W, el. 161 feet (49 m) [66]
- Mud Lake, 34°33′37″N 091°14′57″W / 34.56028°N 91.24917°W, el. 148 feet (45 m) [67]
- Mule Lake, 34°33′44″N 091°15′49″W / 34.56222°N 91.26361°W, el. 154 feet (47 m) [68]
- Otter Lake, 34°44′49″N 091°21′07″W / 34.74694°N 91.35194°W, el. 164 feet (50 m) [69]
- Passmore Lake, 34°39′53″N 091°19′53″W / 34.66472°N 91.33139°W, el. 151 feet (46 m) [70]
- Pryor Lake, 34°30′52″N 091°12′12″W / 34.51444°N 91.20333°W, el. 144 feet (44 m) [71]
- Rainbow Lake, 34°46′05″N 091°21′10″W / 34.76806°N 91.35278°W, el. 164 feet (50 m) [72]
- Red Cat Lake, 34°37′50″N 091°18′20″W / 34.63056°N 91.30556°W, el. 154 feet (47 m) [73]
- Round Lake, 34°33′52″N 091°17′05″W / 34.56444°N 91.28472°W, el. 151 feet (46 m) [74]
- Round Pond, 34°29′26″N 091°13′45″W / 34.49056°N 91.22917°W, el. 151 feet (46 m) [75]
- Round Pond, 34°42′08″N 091°19′15″W / 34.70222°N 91.32083°W, el. 161 feet (49 m) [76]
- Sandy Slough, 34°21′23″N 091°02′55″W / 34.35639°N 91.04861°W, el. 148 feet (45 m) [77]
- Section 16 Lake, 34°57′31″N 091°12′24″W / 34.95861°N 91.20667°W, el. 174 feet (53 m) [78]
- Simpson Lake, 34°24′47″N 091°08′40″W / 34.41306°N 91.14444°W, el. 151 feet (46 m) [79]
- Slaughters Lake, 34°42′53″N 091°23′00″W / 34.71472°N 91.38333°W, el. 154 feet (47 m) [80]
- Straight Lake, 34°46′08″N 091°21′57″W / 34.76889°N 91.36583°W, el. 164 feet (50 m) [81]
- Straight Lake, 34°53′13″N 091°21′14″W / 34.88694°N 91.35389°W, el. 171 feet (52 m) [82]
- Upper Crooked Lake, 34°33′12″N 091°16′28″W / 34.55333°N 91.27444°W, el. 148 feet (45 m) [83]
- Upper Eagle Nest Lake, 34°31′05″N 091°13′22″W / 34.51806°N 91.22278°W, el. 154 feet (47 m) [84]
- Upper Forked Lake, 34°29′53″N 091°11′56″W / 34.49806°N 91.19889°W, el. 154 feet (47 m) [85]
- Upper Hooked Lake, 34°27′07″N 091°09′20″W / 34.45194°N 91.15556°W, el. 151 feet (46 m) [86]
- Upper Old River, 34°43′31″N 091°21′36″W / 34.72528°N 91.36000°W, el. 161 feet (49 m) [87]
- Upper Swan Lake, 34°24′50″N 091°07′37″W / 34.41389°N 91.12694°W, el. 148 feet (45 m) [88]
- Waters Bayou, 34°22′29″N 091°04′22″W / 34.37472°N 91.07278°W, el. 141 feet (43 m) [89]
- White Oak Lake, 34°29′36″N 091°10′31″W / 34.49333°N 91.17528°W, el. 154 feet (47 m) [90]
- Willow Lake, 34°27′15″N 091°08′42″W / 34.45417°N 91.14500°W, el. 144 feet (44 m) [91]
- Wire Lake, 34°32′21″N 091°17′23″W / 34.53917°N 91.28972°W, el. 157 feet (48 m) [92]
Reservoirs
edit- Brinkley Lake, 34°53′01″N 091°09′50″W / 34.88361°N 91.16389°W, el. 187 feet (57 m) [93]
- Caney Slash, 34°53′03″N 091°13′02″W / 34.88417°N 91.21722°W, el. 190 feet (58 m) [94]
- Carnes Lake, 34°34′04″N 091°21′10″W / 34.56778°N 91.35278°W, el. 200 feet (61 m) [95]
- Cruthis Lake, 34°36′54″N 091°21′36″W / 34.61500°N 91.36000°W, el. 187 feet (57 m) [96]
- Lake Greenlee, 34°52′29″N 091°10′00″W / 34.87472°N 91.16667°W, el. 187 feet (57 m) [97]
- Lake Greenlee Reservoir, 34°52′00″N 091°09′48″W / 34.86667°N 91.16333°W, el. 184 feet (56 m) [98]
- McCollum Lake, 34°37′44″N 091°25′37″W / 34.62889°N 91.42694°W, el. 197 feet (60 m) [99]
- Midway Lake, 34°37′41″N 091°21′07″W / 34.62806°N 91.35194°W, el. 184 feet (56 m) [100]
- Water Bayou Reservoir, 34°23′16″N 091°06′45″W / 34.38778°N 91.11250°W, el. 148 feet (45 m) [101]
See also
edit
Notes
edit- ^ "Barnes Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Bear Slough". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Beaver Dam Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Bellknap Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Big Baptize Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Big Cotton Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Big Eagle Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Big Weidmann Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Blue Hole". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Boggy Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Browns Shanty Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Brushy Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Brushy Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Brushy Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Buck Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Bull Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Burnt Cypress Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Clear Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Cloud Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Cooter Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Crab Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Crosspond Bayou". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Crowfoot Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Dodson Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Eagle Nest Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Eagle Nest Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "East Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "First Old River". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Fish Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Forked Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Goose Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Goose Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Goose Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Goose Lakes". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Goose Pond". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Graveyard Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Green Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Hart Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Heifer Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Hickson Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Hog Thief Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Hole in the Wall". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Horseshoe Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Horseshoe Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Horseshoe Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Ingram Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Kansas Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Lambert Bayou". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Little Baptize Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Little Cotton Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Little Eagle Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Little Long Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Little Moon Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Little Weidmann Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Long Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Long Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Long Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Lost Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Lower Crooked Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Lower Eagle Nest Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Lower Forked Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Middle Crooked Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Middle Old River". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Mill Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Moon Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Mud Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Mud Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Mule Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Otter Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Passmore Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Pryor Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Rainbow Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Red Cat Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Round Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Round Pond". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Round Pond". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Sandy Slough". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Section 16 Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Simpson Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Slaughters Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Straight Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Straight Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Upper Crooked Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Upper Eagle Nest Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Upper Forked Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Upper Hooked Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Upper Old River". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Upper Swan Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Waters Bayou". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "White Oak Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Willow Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Wire Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Brinkley Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Caney Slash". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Carnes Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Cruthis Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Lake Greenlee". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Lake Greenlee Reservoir". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "McCollum Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Midway Lake". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
- ^ "Water Bayou Reservoir". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.