anchor.diff:  475,181,"3719","NORTH CAROLINA","WACCAMAW LAKE","COLUMBUS","NATURAL",251.2,36.17,1.5,2.6,242,"days",11,63,1.1,0.018,0.004,0.12,0.63,NA,NA,125,2050,2175,NA,NA,4675,98270,102945,1270,42,0.06,60215,42,2.8,34.303056,-78.524444,NA
   475,182,"3718","NORTH CAROLINA","WATERVILLE LAKE","HAYHOOD","IMPOUNDMENT",1178.4,1.38,22.7,23.8,15,"days",33,348,0.8,0.103,0.041,0.86,1.14,23470,NA,NA,105280,128750,131375,NA,NA,1210275,1341650,63440,51,93.3,921575,31,972.2,35.775,-83.1,3.8
   475,183,"3928","OHIO","ATWOOD RESERVOIR","CARROL TUSCAHAWAS","IMPOUNDMENT",181,6.23,4.7,1.9,178,"days",47,266,1,0.031,0.005,0.205,0.905,2525,NA,55,7800,10380,6250,NA,2130,127210,135590,3625,65,1.67,99260,27,21.8,40.529722,-81.274444,16.4
  -475,184,"3901","OHIO","BEACH CITY RESERVOIR","STARK TUSCARAWAS","IMPOUNDMENT",777,1.7,1.2,7.6,3,"days",72,470,0.3,0.122,0.015,1.99,2.91,3990,NA,560,41605,46155,11970,NA,20970,828365,361305,38480,17,27.15,758765,12,506.6,40.635556,-81.56,10.9
  +475,184,"3901","OHIO","BEACH CITY RESERVOIR","STARK TUSCARAWAS","IMPOUNDMENT",777,1.7,1.2,7.6,3,"days",72,470,0.3,0.122,0.015,1.99,2.91,3990,NA,560,41605,46155,11970,NA,20970,828365,861305,38480,17,27.15,758765,12,506.6,40.635556,-81.56,10.9
   475,185,"3929","OHIO","BERLIN RESERVOIR","MAHONING PORTAGE STARK","IMPOUNDMENT",642.3,8.9,4.9,6.4,81,"days",74,400,0.9,0.042,0.006,0.9,1.47,34990,NA,180,17095,52265,83870,NA,6685,441030,531585,12595,76,5.87,394940,26,59.7,41.043611,-81.004444,15.5
   475,186,"3902","OHIO","BUCKEYE LAKE","FAIRFIELD LICKING PERRY","NATURAL",114.5,12.71,1.9,1.2,233,"days",77,287,0.3,0.179,0.02,0.38,2.69,1580,NA,235,4675,6490,3805,NA,8840,99110,111755,5915,9,0.51,86465,23,8.8,39.903611,-82.519444,186.6
   475,187,"3905","OHIO","CHARLES MILL RESERVOIR","ASHLAND RICHLAND","IMPOUNDMENT",562,5.46,1.7,5.4,20,"days",127,380,0.4,0.127,0.011,0.465,1.795,17380,NA,50,12920,30350,47700,NA,1895,447055,496650,25060,17,5.56,448155,10,91,40.777222,-82.391667,67.1
  
positive.code: 476,105,"3812","NORTH DAKOTA","LANE SAKAKAWEA","DUNNHCNENzIEHCLEANHERCERMOUNTRAILHILLIAHS","IMPOUNDMENT",469825.8,1490.21,18.9,652.93,1.6,"years",167,549,2.3,0.016,0.007,0.15,0.33,17655,NA,10,6680100,6697765,52950,NA,455,28083775,28137180,462250,93,4.49,10446205,63,18.9,47.504167,-101.433333,6.9
  476,107,"3813","NORTH DAKOTA","SPIRITWOOD LAKE","STUTSMAN","NATURAL",NA,1.67,8.8,NA,NA,"years",376,2325,2.1,0.156,0.082,0.29,2.54,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,47.076389,-98.595,34.7
  476,108,"3814","NORTH DAKOTA","SWEET BRIAR LAKE","MORTON","IMPOUNDMENT",393.7,1.1,2.9,0.232,183,"days",280,579,1.5,0.092,0.031,0.09,1.32,NA,NA,10,1875,1885,NA,NA,420,23010,23430,1030,45,1.71,12265,48,21.3,46.864444,-101.26,39
  476,109,"3815","NORTH DAKOTA","WHITMAN LAKE","NELSONHALSH","IMPOUNDMENT",111.4,858,2.7,81,255,"days",182,406,0.5,0.26,0.185,0.26,1.32,NA,NA,5,NA,NA,NA,NA,105,5235,NA,520,NA,0.83,5340,0,9.2,48.185,-98.075,27.1
  476,11,"0501","ARKANSAS","BEAVER RESERVOIR","BENTON CARROLL o IASHINGTON","IMPOUNDMENT",3087.3,114.2,17.8,42.45,1.5,"years",49,94,2.1,0.022,0.006,0.33,0.61,45860,NA,10,36160,82010,159785,NA,385,1448335,1608505,18580,77,0.72,1110180,31,14.1,36.420833,-93.851389,3.9
  476,110,"4001","OKLAHOMA","ALTUS RESERVOIR","GREER KIOMA","IMPOUNDMENT",5480.4,25.41,6.4,4.09,2.1,"years",143,2019,0.8,0.041,0.01,0.06,0.63,NA,NA,5,10700,10705,NA,NA,120,902625,902745,3910,63,0.42,96825,89,35.5,34.8875,-99.291667,14.8
  476,111,"4002","OKLAHOMA","ARBUCKLE LAKE","MURRAY","IMPOUNDMENT",326.3,9.51,9.4,1.34,3.2,"years",158,379,1.4,0.02,0.008,0.07,0.44,NA,NA,NA,3810,3810,NA,NA,NA,61220,61220,885,77,0.4,28905,53,6.4,34.425833,-96.999167,7
  476,112,"4003","OKLAHOMA","LAKE ELSWORTH","CADDO COMANCHE","IMPOUNDMENT",642.3,22.66,5.1,4.26,1.4,"years",150,367,1,0.037,0.009,0.07,0.62,1980,NA,5,3510,5495,4480,NA,160,158970,163610,4665,15,0.24,89635,45,7.2,34.800833,-98.355,8.4
  476,113,"4004","OKLAHOMA","LAKE EUFAULA","HASKELL MCINTOSH OKMULGEEo PITTSBURG","IMPOUNDMENT",97958.9,414.81,10.1,181.73,309,"days",88,382,0.4,0.081,0.029,0.405,0.81,429755,NA,10,1297160,1726905,868285,NA,270,10349635,11218190,1084280,37,4.16,10392320,7,27,35.307778,-95.359444,4.4
  476,114,"4005","OKLAHOMA","FORT COBB RESERVOIR",NA,"IMPOUNDMENT",787.4,16.47,6.4,1.23,7.6,"years",157,450,1.1,0.038,0.012,0.11,0.76,260,NA,5,9105,9370,775,NA,115,105525,106415,590,94,0.57,16100,85,6.5,35.165278,-98.455556,15
  476,115,"4006","OKLAHOMA","FORT SUPPLY RESERVOIR","MOODuARO","IMPOUNDMENT",3869.5,7.61,11.9,2.31,1.6,"years",184,797,0.4,0.07,0.014,0.135,0.69,980,NA,5,2335,3320,2930,NA,105,49440,52475,26700,20,0.44,60715,NA,6.9,36.55,-99.569444,9.7
  476,116,"4007","OKLAHOMA","FOSS RESERVOIR","CUSTER","IMPOUNDMENT",3859.1,35.61,8.9,2.89,43.7,"years",151,1879,0.9,0.027,0.006,0.09,0.7,310,NA,5,9300,9675,1105,NA,160,193865,195130,NA,NA,0.27,NA,NA,5.5,35.541111,-99.187222,4.9
  476,117,"4008","OKLAHOMA","LAKE FRANCES","AOAIR","IMPOUNDMENT",1644.6,2.31,1.8,16.47,3,"days",99,189,0.4,0.142,0.093,1.78,2.135,595,NA,NA,84185,84780,1785,NA,NA,1326215,1328000,66540,22,36.7,1069760,19,574.9,36.125,-94.515,8
  476,118,"4009","OKLAHOMA","GRND LK O' THE CHEROKEES","HAYES DELAWARE CRAIG OTTONA","IMPOUNDMENT",26671.5,188.18,10.9,194.68,129,"days",97,253,0.8,0.087,0.038,0.74,1.13,34600,12585,60,1250605,1297850,95125,4025,2335,13481690,13583175,684480,47,6.9,10157185,25,72.2,36.475,-95.035,6.8
  476,12,"0504","ARKANSAS","BULL SHOALS RESERVOIR","BAXTER BOONE MARION AR! TANEY OZARK MO","IMPOUNDMENT",15672.1,183.89,20.4,165.04,259,"days",131,223,3.4,0.015,0.004,0.38,0.53,1475,NA,35,101670,103180,4420,NA,1225,6945940,6951585,64915,37,0.56,3777390,46,37.8,36.3675,-92.572222,3.9
  
negative.code: 476,147,"4621","SOUTH DAKOTA","PICKEREL LAKE","DAY","NATURAL",NA,3.86,6.1,NA,NA,"years",242,390,1.5,0.049,0.009,0.095,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,45.484722,-97.265833,15.8
  476,148,"4622","SOUTH DAKOTA","LAKE POINSETT","HROOKINGboHAMLIN","NATURAL",733,29.26,2.9,0.073,35.4,"years",267,1038,0.8,0.115,0.023,0.315,2.765,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,44.547222,-97.080556,40.2
  476,149,"4623","SOUTH DAKOTA","SOUTH RED IRON LAKE","MARSHALL","NATURAL",NA,2.51,2.1,NA,NA,"years",216,515,1.8,0.042,0.01,0.11,1.52,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,45.491667,-96.266667,6.9
  476,15,"2904","MISSOURI","LAKE TANEYCOMO","TANEY","IMPOUNDMENT",11297.6,12.22,5.8,123.81,7,"days",96,155,2,0.023,0.007,0.53,0.72,5125,NA,10,69010,74145,9555,NA,415,6234120,6244090,87280,NA,6.07,6038630,3,511,36.657778,-93.124722,9.8
  476,150,"4624","SOUTH DAKOTA","RICHMOND LAKE","RROMN","IMPOUNDMENT",450.7,3.35,4.6,0.016,54,"years",265,905,2.3,0.187,0.144,0.15,1.57,NA,NA,30,345,375,NA,NA,1145,4930,6075,30,92,0.11,410,93,1.8,45.552778,-98.6,18.5
  476,151,"4625","SOUTH DAKOTA","ROY LAKE","MARSHALL","NATURAL",NA,6.85,3.3,NA,NA,"years",262,1152,1.8,0.034,0.01,0.07,1.97,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,45.691667,-97.425,13.3
  476,152,"4626","SOUTH DAKOTA","SAND LAKE",NA,"IMPOUNDMENT",10308.2,3.1,0.8,2.364,12,"days",314,849,0.7,0.489,0.288,0.11,2.29,3060,NA,NA,18855,21915,9180,NA,NA,171950,181130,17010,22,7.07,142740,21,58.4,45.6675,-98.305556,NA
  476,153,"4627","SOUTH DAKOTA","SHERIDAN LAKE","PENNINGTON","IMPOUNDMENT",230.5,1.56,10.2,0.14,3.6,"years",104,177,2.7,0.053,0.016,0.105,0.565,NA,NA,5,290,295,NA,NA,245,5075,5320,170,42,0.19,3060,42,3.4,43.975278,-103.451667,15.4
  476,154,"4628","SOUTH DAKOTA","STOCKADE LAKE","CUSTER","IMPOUNDMENT",202,0.53,5.8,0.135,274,"days",118,227,1.7,0.233,0.109,0.15,1.27,235,NA,NA,425,660,540,NA,NA,5050,5590,1075,NA,1.25,14780,NA,10.5,43.763889,-103.5125,25.4
  476,155,"4629","SOUTH DAKOTA","EAST VERMILLION LAKE","MCCOOK","IMPOUNDMENT",1036,2.23,3.7,0.095,2.8,"years",149,695,0.7,0.211,0.092,0.1,1.84,NA,NA,5,655,660,NA,NA,90,8440,8530,120,82,0.3,3655,57,3.8,43.590278,-97.1725,100.8
  476,156,"4630","SOUTH DAKOTA","WALL LAKE","HINNEHAHA","NATURAL",NA,0.9,2.6,NA,NA,"years",173,1083,1.5,0.194,0.076,0.16,2.25,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,45.5625,-96.9625,55.3
  476,157,"4631","SOUTH DAKOTA","NORTH WAUBAY LAKE","DAY","NATURAL",NA,14.16,2.7,NA,NA,"years",418,4301,0.8,0.98,0.023,0.145,3.62,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,NA,45.391667,-96.45,127
  476,158,"4801","TEXAS","AMISTAD RESERVOIR",NA,"IMPOUNDMENT",313828.9,262.43,16.5,58.506,3.8,"years",137,823,3.3,0.013,0.009,0.5,0.72,NA,NA,NA,257295,257295,NA,NA,NA,NA,NA,14320,94,0.98,1193690,72,16.2,29.459722,-101.055556,2
  476,159,"4802","TEXAS","LAKE BASTROP","BASTROP","IMPOUNDMENT",24.6,3.67,5.6,0.238,5.2,"years",137,841,2,0.022,0.007,0.09,0.525,NA,NA,NA,985,985,NA,NA,NA,12100,12100,105,89,0.27,2795,77,3.3,30.155556,-97.291667,12.4
  476,16,"0502","ARKANSAS","BLACKFISH LAKE","CRITTENDEN ST FRANCIS","NATURAL",288.8,1.62,1.8,287.1,8,"days",33,88,0.1,0.424,0.09,1.47,2.425,NA,NA,5,112130,112135,NA,NA,275,390625,390900,92130,18,69.22,303920,22,241.3,35.129167,-90.456944,19.8
  476,160,"4803","TEXAS","BELTON RESERVOIR","HELL CURYELL","IMPOUNDMENT",9230.8,50.27,10.8,18.32,1.6,"years",142,388,3.1,0.016,0.007,0.185,0.52,24210,NA,50,174400,198660,57570,NA,1945,894340,953855,17455,91,3.95,480930,50,19,31.106667,-97.475278,8
  