anchor.diff:  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
  +476,109,"3815","NORTH DAKOTA","WHITMAN LAKE","NELSONHALSH","IMPOUNDMENT",111.4,0.58,2.7,0.081,255,"days",182,406,0.5,0.26,0.185,0.26,1.32,NA,NA,5,475,480,NA,NA,105,5235,5340,520,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,10,36140,82010,159785,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
  +476,113,"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,10,1297140,1726905,868285,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
  +476,115,"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,105,49440,52475,2670,20,0.44,60715,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",151,1879,0.9,0.027,0.006,0.09,0.7,370,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
  
positive.code: 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
  475,185,"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
  
negative.code: 475,235,"4701","TENNESSEE","BARKLEY LAKE","STEWART MONTGOMERY TRIGG LYON KY","IMPOUNDMENT",45578.8,234.4,4.6,984.95,16,"days",73,192,0.6,0.128,0.047,0.48,0.84,151515,NA,85,3876940,4028540,437895,NA,3195,29510835,29951925,4209050,NA,17.19,32674930,NA,127.8,37.009722,-88.218056,NA
  475,237,"4704","TENNESSEE","BOONE RESERVOIR","WASHINGTON SULLIVAN CARTER","IMPOUNDMENT",4765.6,17.8,13.3,66.5,42,"days",80,185,1.5,0.052,0.029,0.995,1.205,95130,NA,120,95710,190960,299085,NA,4595,3830640,4134320,99020,48,10.73,2999590,27,232.3,36.438889,-82.437222,NA
  475,238,"4725","TENNESSEE","SOUTH HOLSTON RESERVOIR","SULLIVAN IN WASHINGTON VA","IMPOUNDMENT",1820.8,30.68,26.4,25.32,370,"days",80,166,2.4,0.014,0.008,0.57,0.855,22030,NA,10,31950,53990,61465,NA,335,1330460,1392260,8300,85,1.76,894550,36,45.4,36.559444,-82.087778,7.7
  475,239,"4706","TENNESSEE","CHEATHAM RESERVOIR","CHEATHAM DAVIDSON","IMPOUNDMENT",36682.2,30.15,4.3,625.1,2,"days",59,171,0.7,0.142,0.084,0.46,0.72,286690,NA,60,2892575,3179325,832305,NA,2280,20950475,21785060,4466890,NA,105.45,17655215,19,722.6,36.319167,-87.226111,8.2
  475,24,"1002","DELAWARE","KILLEN POND","KENT","IMPOUNDMENT",46.4,0.3,1.5,0.68,8,"days",17,100,0.5,0.17,0.042,1.61,2.55,15,2345,5,2155,4520,90,12320,10,53550,65970,2410,47,15.07,62450,5,219.9,38.981111,-75.530556,116.2
  475,240,"4720","TENNESSEE","OLD HICKORY RESERVOIR","DAVIDSON RUTHERFORD","IMPOUNDMENT",30233.1,91.06,5.6,519,11,"days",52,148,0.8,0.058,0.019,0.33,0.55,34500,NA,80,1324525,1359105,86820,NA,2925,16887315,16977060,1497710,NA,14.93,18096625,NA,186.4,36.294444,-86.654167,8.9
  475,242,"4723","TENNESSEE","J PERCY PRIEST HES","DAVIDSON RUTHERFORD","IMPOUNDMENT",2310.3,57.47,8.5,40.58,139,"days",128,255,1.8,0.056,0.021,0.155,0.565,72720,825,30,199240,272815,121335,1920,1170,1443160,1567585,244995,10,4.75,1485790,5,27.3,36.154167,-86.601389,10
  475,243,"4707","TENNESSEE","CHEROKEE LAKE","JEFFERSON HAMBLEN GRAINGER HARKINS","IMPOUNDMENT",8878.5,122.62,14.9,120.6,190,"days",90,265,1.3,0.051,0.022,0.78,1.27,34705,NA,30,435065,469800,87185,NA,1205,6738050,6826440,174735,63,3.83,6402390,6,55.7,36.165833,-83.495833,12.2
  475,244,"4708","TENNESSEE","CHICKAMAUGA RESERVOIR","HAMILTON RHEA MEIGS MCMINN","IMPOUNDMENT",53846.1,143.25,5.4,924.8,11,"days",59,160,0.9,0.031,0.012,0.44,0.6,60155,NA,45,1246155,1306355,176255,NA,1790,46174325,46352370,1101375,16,9.12,26652990,42,323.6,35.102778,-85.225,3.1
  