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Data Set #008

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About the Data

About the Reservoir Data

The data provide a snapshot in time of basin, lake and reservoir capacities in the western states of Arizona, California, Colorado, Idaho, Montana, New Mexico, Nevada, Oregon, Utah, Washington, and Wyoming.  Most reservoir water in these states is used for hydropower and agriculture. Capacity statistics are useful for making release and allocation decisions, and are an indicator of a basin's water budget. Is it fair to graph water levels for reservoirs in Arizona (dry) and Oregon (wet) in the same graph? In which states would the distribution of reservoir levels differ significantly from that of all western states, as displayed in the graph? In what ways would the histogram change in drier or wetter years? What would the histogram look like in March or April? How about in August or September?

The diagram of water levels is a classic example of a negatively skewed or left-skewed histogram. In a negatively skewed histogram, the mean lies to the left of the median as it is more sensitive to the extremely low basin levels. An excellent statistical exercise is to transform the horizontal scale so that the histogram is more symmetrical (closer to normal), and then compute the mean and standard deviation.

Source: National Water and Climate Center (NWCC), part of the Natural Resources Conservation Service - an  agency of the US Department of Agriculture.  The web site is  http://www.wcc.nrcs.usda.gov/ .

     
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Basin Area, Lake or Resevoir in
AZ, CA, CO, ID, MT, NM, NV, OR, UT, WA, WY

12/31/98 Level as % of Capacity

SALT RIVER RES SYSTEM, AZ

59

LAKE PLEASANT, AZ

49

VERDE RIVER RES SYSTEM, AZ

33

SAN CARLOS, AZ

9

LYMAN RESERVOIR, AZ

3

SHOW LOW LAKE, AZ

51

LAKE HAVASU, AZ

98

LAKE MOHAVE, AZ

85

LAKE MEAD, AZ

95

LAKE POWELL, AZ

89

BOCA RESERVOIR, CA

80

BRIDGEPORT RESERVOIR, CA

83

LAHONTAN RESERVOIR, CA

77

LAKE MEAD, CA

95

LAKE MOHAVE, CA

85

LAKE TAHOE, CA

74

PROSSER RESERVOIR, CA

34

RYE PATCH RESERVOIR, CA

68

STAMPEDE RESERVOIR, CA

90

TOPAZ RESERVOIR, CA

82

WILDHORSE RESERVOIR, CA

75

ADOBE, CO

84

ANTERO, CO

100

BARR LAKE, CO

72

BLACK HOLLOW, CO

38

BLUE MESA, CO

70

BOYD LAKE, CO

80

CACHE LA POUDRE, CO

55

CARTER, CO

51

CHAMBERS LAKE, CO

56

CHEESMAN, CO

63

CLEAR CREEK, CO

75

COBB LAKE, CO

46

CONTINENTAL, CO

21

CRAWFORD, CO

48

DILLON, CO

96

ELEVEN MILE, CO

102

EMPIRE, CO

68

FOSSIL CREEK, CO

54

FRUITGROWERS, CO

84

FRUITLAND, CO

10

GREAT PLAINS, CO

65

GREEN MOUNTAIN, CO

53

GROSS, CO

63

GROUNDHOG, CO

76

HALLIGAN, CO

94

HOLBROOK, CO

76

HOMESTAKE, CO

97

HORSE CREEK, CO

86

HORSECREEK, CO

79

HORSETOOTH, CO

48

JACKSON, CO

56

JACKSON GULCH, CO

52

JOHN MARTIN, CO

80

JULESBURG, CO

59

LAKE GRANBY, CO

89

LAKE HENRY, CO

41

LAKE LOVELAND, CO

85

LEMON, CO

42

LONE TREE, CO

92

MARIANO, CO

72

MARSHALL, CO

62

MARSTON, CO

81

MCPHEE, CO

69

MEREDITH, CO

95

MILTON, CO

68

MORROW POINT, CO

91

NARRAGUINNEP, CO

94

PAONIA, CO

17

PLATORO, CO

35

POINT OF ROCKS, CO

46

PREWITT, CO

54

PUEBLO, CO

73

RIDGWAY, CO

79

RIO GRANDE, CO

37

RIVERSIDE, CO

45

RUEDI, CO

70

SANCHEZ, CO

35

SANTA MARIA, CO

19

SPINNEY MOUNTAIN, CO

55

STAGECOACH, CO

90

STANDLEY, CO

92

TAYLOR PARK, CO

60

TERRACE, CO

44

TERRY LAKE, CO

69

TRINIDAD, CO

26

TURQUOISE, CO

81

TWIN LAKES, CO

81

UNION, CO

83

VALLECITO, CO

57

VEGA, CO

36

WILLIAMS FORK, CO

83

WILLOW CREEK, CO

72

WINDSOR, CO

66

YAMCOLO, CO

84

AMERICAN FALLS, ID

70

ANDERSON RANCH, ID

84

ARROWROCK, ID

62

BEAR LAKE, ID

80

BLACKFOOT, ID

75

BROWNLEE, ID

95

CASCADE, ID

69

COEUR D'ALENE, ID

48

DEADWOOD, ID

76

DWORSHAK, ID

70

FLATHEAD LAKE, ID

45

GRASSY LAKE, ID

83

HENRYS LAKE, ID

58

HUNGRY HORSE, ID

75

ISLAND PARK, ID

85

JACKSON LAKE, ID

70

LAKE LOWELL (DEER FLAT), ID

62

LITTLE WOOD, ID

64

LUCKY PEAK, ID

39

MACKAY, ID

68

MAGIC, ID

67

MANN CREEK, ID

35

MONTPELIER CREEK, ID

55

NOXON RAPIDS, ID

93

OAKLEY, ID

51

OWYHEE, ID

67

PALISADES, ID

86

PEND OREILLE, ID

58

PRIEST LAKE, ID

49

RIRIE, ID

47

SALMON FALLS, ID

42

WILDHORSE RESERVOIR, ID

75

BAIR, MT

40

BEAVER CREEK, MT

77

BIGHORN LAKE, MT

70

CAMAS, MT

73

CANYON FERRY LAKE, MT

82

CLARK CANYON, MT

58

COMO, MT

14

COONEY, MT

62

DEADMAN'S BASIN, MT

70

ENNIS LAKE, MT

82

FLATHEAD LAKE, MT

45

FORT PECK LAKE (MAF), MT

82

FOUR HORNS LAKE, MT

48

FRESNO, MT

38

GIBSON, MT

30

HAUSER & HELENA, MT

103

HEBGEN LAKE, MT

88

HELENA VALLEY, MT

52

HOLTER LAKE, MT

99

HUNGRY HORSE, MT

75

LAKE ELWELL (TIBER), MT

54

LAKE FRANCES, MT

42

LAKE HELENA, MT

107

LAKE KOOCANUSA, MT

62

LAKE SHERBURNE, MT

15

LIMA, MT

54

LOWER TWO MEDICINE LAKE, MT

0

LOWER WILLOW CREEK, MT

43

MARTINSDALE, MT

46

MIDDLE CREEK, MT

57

MISSION VALLEY, MT

25

MYSTIC LAKE, MT

37

NELSON, MT

56

NEVADA CREEK, MT

51

NEWLAN CREEK, MT

73

NOXON RAPIDS, MT

93

PAINTED ROCKS LAKE, MT

24

PISHKUN, MT

62

RUBY RIVER, MT

55

SMITH RIVER, MT

64

SWIFT, MT

48

TONGUE RIVER, MT

9

WILLOW CREEK, MT

87

BOCA RESERVOIR, NV

80

BRIDGEPORT RESERVOIR, NV

83

LAHONTAN RESERVOIR, NV

77

LAKE MEAD, NV

95

LAKE MOHAVE, NV

85

LAKE TAHOE, NV

74

PROSSER RESERVOIR, NV

34

RYE PATCH RESERVOIR, NV

68

STAMPEDE RESERVOIR, NV

90

TOPAZ RESERVOIR, NV

82

WILDHORSE RESERVOIR, NV

75

ABIQUIU, NM

31

BRANTLEY, NM

17

CABALLO, NM

5

COCHITI, NM

12

CONCHAS, NM

71

COSTILLA, NM

30

EL VADO, NM

57

ELEPHANT BUTTE, NM

80

HERON, NM

77

LAKE AVALON, NM

30

NAVAJO, NM

83

SANTA ROSA, NM

11

SUMNER, NM

14

BEULAH RES, OR

61

BLUE RIVER, OR

36

BULLY CREEK, OR

60

CLEAR LAKE (CA)

59

CLEAR LAKE, OR

21

COLD SPRINGS, OR

24

COTTAGE GROVE, OR

14

COTTONWOOD, OR

48

COUGAR, OR

18

CRANE PRAIRIE, OR

76

CRESCENT LAKE, OR

80

DETROIT, OR

45

DORENA, OR

33

DREWS, OR

77

EMIGRANT LAKE, OR

51

FALL CREEK , OR

20

FERN RIDGE, OR

36

FISH LAKE, OR

74

FOSTER, OR

4

FOURMILE LAKE, OR

75

GERBER, OR

82

GREEN PETER, OR

48

HENRY HAGG LAKE, OR

90

HILLS CREEK, OR

19

HOWARD PRAIRIE, OR

81

HYATT PRAIRIE, OR

74

LOOKOUT POINT, OR

22

LOST CREEK , OR

0

MCKAY, OR

34

OCHOCO, OR

55

OWYHEE, OR

67

PHILLIPS LAKE, OR

58

PRINEVILLE, OR

60

THIEF VALLEY, OR

103

THOMPSON VALLEY, OR

78

TIMOTHY LAKE, OR

0

UNITY, OR

43

UPPER KLAMATH LK, OR

72

WALLOWA LAKE, OR

64

WARMSPRINGS, OR

57

WICKIUP, OR

86

BEAR LAKE, UT

80

CAUSEY, UT

46

DEER CREEK, UT

83

EAST CANYON, UT

75

ECHO, UT

83

GUNNISON, UT

90

HUNTINGTON NORTH, UT

90

HYRUM, UT

72

JOE'S VALLEY, UT

77

LOST CREEK, UT

4

MILL SITE, UT

83

MINERSVILLE (RkyFd), UT

105

MOON LAKE, UT

63

OTTER CREEK, UT

87

PINEVIEW, UT

73

PIUTE, UT

84

PORCUPINE, UT

0

ROCKPORT, UT

70

SCOFIELD, UT

65

SETTLEMENT CREEK, UT

96

SEVIER BRIDGE, UT

89

STARVATION, UT

78

STEINAKER, UT

99

UTAH LAKE, UT

104

VERNON CREEK, UT

83

WILLARD BAY, UT

81

BANKS, WA

96

BUMPING LAKE, WA

64

CHELAN LAKE, WA

58

CLE ELUM, WA

34

COEUR D'ALENE, WA

48

CONCONULLY RESERVOIR, WA

75

KACHESS, WA

52

KEECHELUS, WA

44

RIMROCK, WA

43

ROOSEVELT, WA

81

ROSS, WA

77

SALMON LAKE, WA

79

ALCOVA, WY

85

ANGOSTURA, WY

91

BELLE FOURCHE, WY

93

BIG SANDY, WY

81

BIGHORN LAKE, WY

70

BOYSEN, WY

100

BUFFALO BILL, WY

69

BULL LAKE, WY

65

DEERFIELD, WY

94

ENNIS LAKE, WY

82

FONTENELLE, WY

66

GLENDO, WY

69

GLENDO PROJECT USERS, WY

85

GRASSY LAKE, WY

83

GUERNSEY, WY

31

HEBGEN LAKE, WY

88

JACKSON LAKE, WY

70

KENDRICK PROJECT, WY

82

KEYHOLE, WY

91

NORTH PLATTE PROJ, WY

76

PACTOLA, WY

94

PALISADES, WY

86

PATHFINDER, WY

86

PILOT BUTTE, WY

72

SEMINOE, WY

74

SHADEHILL, WY

71

TONGUE RIVER, WY

9

 

Bin

Frequency

0-10

11

10-20

12

20-30

8

30-40

22

40-50

29

50-60

33

60-70

35

70-80

54

80-90

58

90-100

30

100-110

8

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