The Vigil Network

The Vigil Network was created in the early 1960s to address the need for long-term, broad spectrum data collection to facilitate the study of the effects of global climate change. It is a system of small sites and drainage basins where geomorphic, hydrologic, and biological data are periodically collected. Observation periods are intended to be greater than the life span of a single individual, and data are intended to be archived in a readily retrievable format to allow study by future generations of scientists.

Several of the sites' pages are still formatted for a previous version of this web site. We are currently in the process of converting them to the current site format. All data files for these sites can still be downloaded during our "remodeling".

The original data files for sites 79-82 are not currently available for us to digitize. We are attempting to locate these files. If and when we do find them, we will add them to the site inventory.

Questions about the requirements for including a site in the Vigil Network should be addressed to Dr. Waite Osterkamp at wroster@usgs.gov.

Vigil Network Sites

Please note that our web pages are currently being re-designed, therefore some sites will be formatted differently than others.

1. Tongue River, Montana, USA: Lat/Long: 45°23'16"N 106°27'00"W Established June 1979 Basin Area: 120 km² Average Annual Precipitation: 300 mm Channel Cross Sections: 86 Bed Profiles: 5 Erosion Data: None Vegetation Data: None

2. Oconee River, Georgia, USA: Lat/Long: 33°22'30"N 83°18'45"W Established 1969 Basin Area: 7500 km² Average Annual Precipitation: 1200 mm Channel Cross Sections: 18 Bed Profiles: 11 Erosion Data: None Vegetation Data: Yes

3. Tiderishi Creek, Ohio, USA: Lat/Long: 40°55'50"N 83°43'40"W Established January 1947 Basin Area: 12 km² Average Annual Precipitation: 890 mm Channel Cross Sections: 0 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

4. Norwalk Creek, Ohio, USA: Lat/Long: 41°14'00"N 82°32'30"W Established January 1947 Basin Area: 12.7 km² Average Annual Precipitation: 890 mm Channel Cross Sections: 0 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

5. Pueblo Cañon, New Mexico, USA: Lat/Long: 35°31'34"N 105°59'38"W Established August 1970 Basin Area: 22.3 km² Average Annual Precipitation: 300 mm Channel Cross Sections: 41 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: None

6. Cañada de la Cueva, New Mexico, USA: Lat/Long: 35°26'24"N 105°59'49"W Established August 1970 Basin Area: 2.3 km² Average Annual Precipitation: 300 mm Channel Cross Sections: 3 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: None

7. Young Pits Sisters Area, Maryland, USA: Lat/Long: 39°00'15"N 77°10'45"W Established 1964 Basin Area: - km² Average Annual Precipitation: 1040 mm Channel Cross Sections: 0 Bed Profiles: 0 Erosion Data: Yes (mass movement data) Vegetation Data: None

8. East Branch, Brandywine Creek, Pennsylvania, USA: Lat/Long: 40°03'05"N 75°43'20"W Established October 1967 Basin Area: - km² Average Annual Precipitation: 1105 mm Channel Cross Sections: 12 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

9. Hasta Luego Draw, Montana, USA: Lat/Long: 45°41'30"N 108°07'30"W Established July 1950 Basin Area: 0.04 km² Average Annual Precipitation: 330 mm Channel Cross Sections: 6 Bed Profiles: 1 Erosion Data: None Vegetation Data: None

10. Aching Shoulder Slope, New Mexico, USA: Lat/Long: 36°36'19"N 108°56'43"W Established August 1963 Basin Area: - km² Average Annual Precipitation: 220 mm Channel Cross Sections: 3 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: None

11. Ski Basin Slope, New Mexico, USA: Lat/Long: 35°46'07"N 105°48'26"W Established August 1963 Basin Area: - km² Average Annual Precipitation: 400 mm Channel Cross Sections: 0 Bed Profiles: 0 Erosion Data: Yes (mass movement data) Vegetation Data: None

12. Big View Slope, Wyoming, USA: Lat/Long: 42°53'51"N 109°02'16"W Established July 1963 Basin Area: - km² Average Annual Precipitation: 400 mm Channel Cross Sections: 0 Bed Profiles: 0 Erosion Data: Yes Vegetation Data: None

13. Last Day Gully, Wyoming, USA: Lat/Long: 42°55'33"N 108°34'19"W Established August 1962 Basin Area: 0.22 km² Average Annual Precipitation: 250 mm Channel Cross Sections: 16 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: None

14. Forsaken Gully, Wyoming, USA: Lat/Long: 43°11'24"N 107°44'07"W Established August 1962 Basin Area: 0.04 km² Average Annual Precipitation: 200 mm Channel Cross Sections: 9 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: None

15. Gullies Number One and Two, Wyoming, USA: Lat/Long: 44°41'12"N 106°06'38"W Established July 1950 Basin Area: - km² Average Annual Precipitation: 330 mm Channel Cross Sections: 0 Bed Profiles: 0 Erosion Data: Yes Vegetation Data: None

16. Near Dark Gully, Wyoming, USA: Lat/Long: 44°41'12"N 106°05'00"W Established July 1950 Basin Area: 0.02 km² Average Annual Precipitation: 330 mm Channel Cross Sections: 5 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: Yes

17. Drainage Area Number One, Wyoming, USA: Lat/Long: 43°13'18"N 104°36'41"W Established July 1950 Basin Area: 0.04 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 0 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

18. Drainage Area Number Two, Wyoming, USA: Lat/Long: 43°03'04"N 104°37'30"W Established July 1950 Basin Area: 0.2 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 6 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: None

19. Typical Section Number Three, Wyoming, USA: Lat/Long: 43°07'40"N 104°36'43"W Established August 1962 Basin Area: - km² Average Annual Precipitation: 380 mm Channel Cross Sections: 0 Bed Profiles: 0 Erosion Data: Yes Vegetation Data: None

20. Ditch Creek, Wyoming, USA: Lat/Long: 43°40'15"N 110°35'30"W Established July 1989 Basin Area: 69.9 km² Average Annual Precipitation: 810 mm Channel Cross Sections: 2 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

21. Plum Creek, Colorado, USA: Lat/Long: 39°29'04"N 105°00'07"W Established June 1965 Basin Area: 782 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 4 Bed Profiles: 0 Erosion Data: Yes Vegetation Data: Yes

22. Armells Creek, Montana, USA: Lat/Long: 46°06'03"N 106°45'44"W Established July 1975 Basin Area: 807 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

23. Rosebud Creek, Helvey Ranch, Montana, USA: Lat/Long: 45°14'44"N 106°57'57"W Established July 1975 Basin Area: 95 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 9 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

24. West Fork Muddy Creek, Montana, USA: Lat/Long: 45°32'06"N 106°45'22"W Established August 1975 Basin Area: 91 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 6 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

25. East Fork Sarpy Creek, Montana, USA: Lat/Long: 45°49'02"N 106°59'38"W Established August 1975 Basin Area: 136.5 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

26. Ephemeral Tributary to Rosebud Creek, Montana, USA: Lat/Long: 46°08'38"N 106°27'40"W Established August 1975 Basin Area: 15 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 4 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

27. West Fork Tullock Creek, Montana, USA: Lat/Long: 45°31'29"N 107°07'28"W Established August 1975 Basin Area: 4.5 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

28. North Fork Rosebud Creek, Montana, USA: Lat/Long: 45°12'47"N 107°00'09"W Established August 1975 Basin Area: 21 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 4 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

29. South Fork Rosebud Creek, Montana, USA: Lat/Long: 45°12'45"N 107°00'07"W Established August 1975 Basin Area: 47 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 4 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

30. Main Stem Rosebud Creek, Montana, USA: Lat/Long: 45°12'48"N 107°00'04"W Established August 1975 Basin Area: 69 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

31. Lower Tullock Creek, Montana, USA: Lat/Long: 46°05'45"N 107°25'02"W Established August 1975 Basin Area: 1163 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 4 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

32. Lower Sarpy Creek, Montana, USA: Lat/Long: 46°12'48"N 107°07'39"W Established August 1975 Basin Area: 1165.5 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

33. Lower Owl Creek, Montana, USA: Lat/Long: 45°11'54"N 107°17'23"W Established August 1975 Basin Area: 221 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

34. Sarpy Creek, Montana, USA: Lat/Long: 45°55'07"N 107°07'41"W Established August 1975 Basin Area: 524.5 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

35. Upper Owl Creek, Montana, USA: Lat/Long: 45°07'57"N 107°14'38"W Established August 1975 Basin Area: 170 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 4 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

36. Mid Owl Creek, Montana, USA: Lat/Long: 45°08'47"N 107°15'02"W Established August 1975 Basin Area: 181 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

37. Otter Creek, Trusler Ranch, Montana, USA: Lat/Long: 45°35'16"N 106°15'12"W Established August 1975 Basin Area: 1816.5 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

38. Otter Creek, Shy Ranch, Montana, USA: Lat/Long: 45°31'38"N 106°11'30"W Established August 1975 Basin Area: 1517 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

39. Logging Creek, Montana, USA: Lat/Long: 45°34'32"N 106°24'16"W Established August 1975 Basin Area: 74 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

40. Pumpkin Creek, Montana, USA: Lat/Long: 46°03'21"N 105°33'42"W Established September 1975 Basin Area: 1308.5 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

41. Pumpkin Creek, Roger Ranch, Montana, USA: Lat/Long: 46°12'52"N 105°40'39"W Established September 1975 Basin Area: 1798.5 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

42. Tributary to Hollowwood Creek, Montana, USA: Lat/Long: 45°36'54"N 106°22'52"W Established September 1975 Basin Area: 2 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

43. Ephemeral Tributary, Montana, USA: Lat/Long: 45°49'25"N 107°12'48"W Established September 1975 Basin Area: 2 km² Average Annual Precipitation: 380 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: Yes

44. Beaver Creek, Wisconsin, USA: Lat/Long: 44°02'30"N 91°20'00"W Established 1939 Basin Area: 409.2 km² Average Annual Precipitation: 760 mm Channel Cross Sections: 48 Bed Profiles: 0 Erosion Data: Yes (sedimentation data) Vegetation Data: None

45. Galena River, Wisconsin, USA: Lat/Long: 42°22'30"N 90°27'00"W Established 1940 Basin Area: 518 km² Average Annual Precipitation: 890 mm Channel Cross Sections: 49 Bed Profiles: 0 Erosion Data: Yes (sedimentation data) Vegetation Data: None

46. Beartail Creek, Mississippi, USA: Lat/Long: 34°43'50"N 89°55'15"W Established 1940 Basin Area: 93 km² Average Annual Precipitation: 1320 mm Channel Cross Sections: 9 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

47. Big Spring Creek, Mississippi, USA: Lat/Long: 34°32'30"N 89°27'15"W Established 1939 Basin Area: 145 km² Average Annual Precipitation: 1370 mm Channel Cross Sections: 13 Bed Profiles: 0 Erosion Data: Yes (sedimentation data) Vegetation Data: None

48. Billys Creek, Mississippi, USA: Lat/Long: 34°08'30"N 89°46'30"W Established 1940 Basin Area: 52 km² Average Annual Precipitation: 1340 mm Channel Cross Sections: 4 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

49. Clear Creek, Mississippi, USA: Lat/Long: 34°25'00"N 89°42'45"W Established - Basin Area: 117 km² Average Annual Precipitation: 1340 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

50. Coldwater River, Mississippi, USA: Lat/Long: 34°46'30"N 89°54'30"W Established 1940 Basin Area: 1142 km² Average Annual Precipitation: 1370 mm Channel Cross Sections: 7 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

51. Goose Creek, Mississippi, USA: Lat/Long: 34°24'30"N 89°36'30"W Established 1937 Basin Area: - km² Average Annual Precipitation: 1370 mm Channel Cross Sections: 16 Bed Profiles: 0 Erosion Data: Yes (sedimentation data) Vegetation Data: None

52. Graham Mill Creek, Mississippi, USA: Lat/Long: 34°31'30"N 89°29'30"W Established 1939 Basin Area: 29 km² Average Annual Precipitation: 1340 mm Channel Cross Sections: 17 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

53. Greasy Creek, Mississippi, USA: Lat/Long: 34°28'00"N 89°42'15"W Established 1939 Basin Area: 52 km² Average Annual Precipitation: 1340 mm Channel Cross Sections: 5 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

54. Hurricane Creek, Mississippi, USA: Lat/Long: 34°30'00"N 89°35'15"W Established 1937 Basin Area: 83 km² Average Annual Precipitation: 1370 mm Channel Cross Sections: 22 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

55. King Creek, Mississippi, USA: Lat/Long: 34°28'00"N 89°03'30"W Established 1939 Basin Area: 65 km² Average Annual Precipitation: 1340 mm Channel Cross Sections: 8 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

56. Lee Creek, Mississippi, USA: Lat/Long: 34°31'00"N 89°29'00"W Established 1931 Basin Area: 50 km² Average Annual Precipitation: 1340 mm Channel Cross Sections: 7 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

57. Long Creek, Mississippi, USA: Lat/Long: 34°11'30"N 90°01'00"W Established 1940 Basin Area: 220 km² Average Annual Precipitation: 1340 mm Channel Cross Sections: 6 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

58. Nelson Creek, Mississippi, USA: Lat/Long: 34°10'30"N 89°59'30"W Established 1970 Basin Area: 15 km² Average Annual Precipitation: 1340 mm Channel Cross Sections: 4 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

59. North Tillatoba Creek, Mississippi, USA: Lat/Long: 34°00'30"N 90°05'00"W Established 1940 Basin Area: 132 km² Average Annual Precipitation: 1340 mm Channel Cross Sections: 6 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

60. North Tippah Creek, Mississippi, USA: Lat/Long: 34°42'45"N 89°02'45"W Established 1939 Basin Area: 63 km² Average Annual Precipitation: 1370 mm Channel Cross Sections: 4 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

61. Potacocowa Creek, Mississippi, USA: Lat/Long: 33°34'30"N 90°06'00"W Established 1940 Basin Area: 166 km² Average Annual Precipitation: 1320 mm Channel Cross Sections: 7 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

62. Potlocona Creek, Mississippi, USA: Lat/Long: 34°14'30"N 89°23'30"W Established 1940 Basin Area: 78 km² Average Annual Precipitation: 1340 mm Channel Cross Sections: 4 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

63. Puskus and Cypress Creek, Mississippi, USA: Lat/Long: 34°30'00"N 89°15'30"W Established 1939 Basin Area: 156 km² Average Annual Precipitation: 1340 mm Channel Cross Sections: 11 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

64. Red Banks Creek, Mississippi, USA: Lat/Long: 34°48'30"N 89°46'00"W Established 1940 Basin Area: 96 km² Average Annual Precipitation: 1370 mm Channel Cross Sections: 6 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

65. Strayhorn and Egypt Creek, Mississippi, USA: Lat/Long: 34°36'30"N 90°13'00"W Established 1940 Basin Area: 124 km² Average Annual Precipitation: 1320 mm Channel Cross Sections: 6 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

66. Tippah Creek, Mississippi, US: Lat/Long: 34°42'50"N 89°14'45"W Established 1970 Basin Area: 975 km² Average Annual Precipitation: 1370 mm Channel Cross Sections: 4 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

67. Toby Tubby Creek, Mississippi, USA: Lat/Long: 34°29'00"N 89°40'00"W Established 1937 Basin Area: 145 km² Average Annual Precipitation: 1370 mm Channel Cross Sections: 16 Bed Profiles: 0 Erosion Data: Yes (sedimentation data) Vegetation Data: None

68. Turkey Creek, Mississippi, USA: Lat/Long: 33°54'00"N 89°41'33"W Established 1940 Basin Area: 330 km² Average Annual Precipitation: 1340 mm Channel Cross Sections: 7 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

69. Cypress Creek, Mississippi, USA: Lat/Long: 33°56'30"N 89°41'00"W Established 1940 Basin Area: 57 km² Average Annual Precipitation: 1340 mm Channel Cross Sections: 3 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

70. Wilhite Creek, Mississippi, USA: Lat/Long: 34°32'00"N 88°57'00"W Established 1939 Basin Area: 42 km² Average Annual Precipitation: 1370 mm Channel Cross Sections: 8 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

71. Yalobusha River, Mississippi, USA: Lat/Long: 33°47'00"N 89°59'00"W Established 1940 Basin Area: 4440 km² Average Annual Precipitation: 1340 mm Channel Cross Sections: 9 Bed Profiles: 0 Erosion Data: None Vegetation Data: None

72. Yocona River, Mississippi, USA: Lat/Long: 34°15'00"N 89°17'45"W Established 1970 Basin Area: 1940 km² Average Annual Precipitation: 1370 mm Channel Cross Sections: 12 Bed Profiles: 0 Erosion Data: Yes (sedimentation data) Vegetation Data: None

73. Åbacka Gully, Norrbotten, Sweden: Lat/Long: 66°10'N 22°52'E Established March 1990 Basin Area: 0.7 km² Average Annual Precipitation: 450 mm Channel Cross Sections: 5 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: None

74. De Geer's Gullies, Dalarna, Sweden: Lat/Long: 60°10'N 15°40'E Established March 1990 Basin Area: - km² Average Annual Precipitation: 570 mm Channel Cross Sections: 5 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: None

75. Femtå Gully, Värmland, Sweden: Lat/Long: 60°32'N 13°08'E Established March 1990 Basin Area: 0.06 km² Average Annual Precipitation: 700 mm Channel Cross Sections: 6 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: None

76. Berthåga Gully, Västmarland, Sweden: Lat/Long: 59°52'N 17°35'E Established March 1990 Basin Area: 1.8 km² Average Annual Precipitation: 500 mm Channel Cross Sections: 8 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: None

77. Uvered Gully, Västergötland, Sweden: Lat/Long: 58°21'N 13°03'E Established March 1990 Basin Area: - km² Average Annual Precipitation: 550 mm Channel Cross Sections: 2 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: None

78. Ravlunda Gully, Skäne, Sweden: Lat/Long: 55°43'N 14°12'E Established March 1990 Basin Area: 0.07 km² Average Annual Precipitation: 650 mm Channel Cross Sections: 12 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: None

79. Marimente Hillslope Site, Puerto Rico: Lat/Long: 18°19'11"N 65°45'09"W Established January 1970 Basin Area: 3 km² Average Annual Precipitation: 2500 mm Channel Cross Sections: 0 Bed Profiles: 4 Erosion Data: Yes Vegetation Data: Yes

80. Jorge Jimenez Hillslope Site, Puerto Rico: Lat/Long: 18°04'38"N 66°20'03"W Established January 1970 Basin Area: 0.6 km² Average Annual Precipitation: 950 mm Channel Cross Sections: 0 Bed Profiles: 4 Erosion Data: Yes Vegetation Data: Yes

81. Nahal Yael Watershed, Israel: Lat/Long: 29°35'N 34°56'E Established 1967 Basin Area: 0.6 km² Average Annual Precipitation: 30 mm Channel Cross Sections: 35 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: Yes

82. Metsemotlhaba River, Botswana: Lat/Long: 24°44'S 25°29'E Established 1987 Basin Area: 615 km² Average Annual Precipitation: 400 mm Channel Cross Sections: 15 Bed Profiles: 1 Erosion Data: Yes Vegetation Data: None