Rank
Name
County(s)
Coordinates
Volume
[n 1] (acre-feet)
Volume (
km3 )
Elevation
[n 2]
Inflow
[n 3]
Dam(s)
[n 4]
Image
1
Navajo Reservoir
Archuleta ,
Rio Arriba †,
San Juan †
36°49′12″N 107°36′12″W / 36.82000°N 107.60333°W / 36.82000; -107.60333
[1]
1,708,600
[2]
2.1075
6,089
San Juan
Navajo Dam
2
Blue Mesa Reservoir
Gunnison
38°28′31″N 107°17′16″W / 38.47528°N 107.28778°W / 38.47528; -107.28778
[3]
829,500
[4]
1.2032
7,519
Gunnison River
Blue Mesa Dam
3
John Martin Reservoir
Bent
38°03′59″N 102°57′16″W / 38.06639°N 102.95444°W / 38.06639; -102.95444
[5]
603,500
[6]
0.7444
3,870
Arkansas River
John Martin Dam
4
Lake Granby
Grand
40°08′32″N 105°50′54″W / 40.14222°N 105.84833°W / 40.14222; -105.84833
[7]
539,758
[8]
0.6658
8,280
Colorado River
Granby Dam
5
McPhee Reservoir
Montezuma
37°34′26″N 108°33′29″W / 37.57389°N 108.55806°W / 37.57389; -108.55806
[9]
381,100
[10]
0.4701
6,929
Dolores River
McPhee Dam
6
Pueblo Reservoir
Pueblo
38°15′59″N 104°44′17″W / 38.26639°N 104.73806°W / 38.26639; -104.73806
[11]
349,940
[12]
0.4317
4,899
Arkansas River
Pueblo Dam
7
Dillon Reservoir
Summit
39°37′04″N 106°03′20″W / 39.61778°N 106.05556°W / 39.61778; -106.05556
[13]
257,304
[14]
0.3174
9,022
Blue River
Dillon Dam
8
Bonny Reservoir (Drained, 2011)
Yuma
39°37′16″N 102°10′53″W / 39.62111°N 102.18139°W / 39.62111; -102.18139
[15]
165,238
[16]
[n 5]
0.2038
3,710
South Fork Republican River
Bonny Dam
9
Horsetooth Reservoir
Larimer
40°31′45″N 105°08′51″W / 40.52917°N 105.14750°W / 40.52917; -105.14750
[18]
156,735
[19]
0.1933
5,430
Colorado River via
Colorado-Big Thompson Project ‡
Dixon Canyon, Spring Canyon, Soldier Canyon, Horsetooth
[20]
10
Green Mountain Reservoir
Summit
39°52′44″N 106°18′20″W / 39.87889°N 106.30556°W / 39.87889; -106.30556
[21]
153,639
[22]
0.1895
7,950
Blue River
Green Mountain Dam
11
Twin Lakes Reservoir
Lake
39°04′51″N 106°19′15″W / 39.08083°N 106.32083°W / 39.08083; -106.32083
[23]
141,000
[24]
0.1739
9,200
Lake Creek
Twin Lakes Dam
12
Sanchez Reservoir
Costilla
37°06′32″N 105°24′50″W / 37.10889°N 105.41389°W / 37.10889; -105.41389
[25]
137,850
[26]
0.1271
8,261
Ventero Creek
Sanchez Dam
13
Turquoise Lake
Lake
39°15′39″N 106°21′59″W / 39.26083°N 106.36639°W / 39.26083; -106.36639
[27]
129,398
[28]
0.1956
9,869
Boustead Tunnel‡
[29]
Sugar Loaf Dam
14
Vallecito Reservoir
La Plata
37°22′59″N 107°33′47″W / 37.38306°N 107.56306°W / 37.38306; -107.56306
[30]
125,400
[10]
0.1547
7,671
Los Pinos River
Vallecito Dam
15
Morrow Point Reservoir
Gunnison ,
Montrose
38°26′46″N 107°31′19″W / 38.44611°N 107.52194°W / 38.44611; -107.52194
[31]
117,025
[32]
0.1443
7,160
Gunnison River
Morrow Point Dam
16
Carter Lake Reservoir
Larimer
40°19′56″N 105°13′07″W / 40.33222°N 105.21861°W / 40.33222; -105.21861
[33]
112,230
[34]
0.1384
5,759
Colorado River via
Colorado-Big Thompson Project ‡
Carter Lake Dam
17
Taylor Park Reservoir
Gunnison
38°49′36″N 106°35′38″W / 38.82667°N 106.59389°W / 38.82667; -106.59389
[35]
106,210
[36]
0.1310
9,337
Taylor River
Taylor Park Dam
18
Ruedi Reservoir
Pitkin ,
Eagle
39°21′53″N 106°48′54″W / 39.36472°N 106.81500°W / 39.36472; -106.81500
[37]
102,373
[38]
0.1263
7,766
Fryingpan River
Ruedi Dam
19
Nee Gronda Reservoir
Kiowa
38°18′13″N 102°45′24″W / 38.30361°N 102.75667°W / 38.30361; -102.75667
[39]
98,660
[40]
0.1217
3,878
Arkansas River via inlet canal‡
natural depression
20
Elevenmile Canyon Reservoir
Park
38°54′50″N 105°29′50″W / 38.91389°N 105.49722°W / 38.91389; -105.49722
[41]
97,780
[40]
0.1209
8,566
South Platte River
Elevenmile Canyon Dam
21
Williams Fork Reservoir
Grand
40°01′33″N 106°12′50″W / 40.02583°N 106.21389°W / 40.02583; -106.21389
[42]
96,822
[43]
0.1194
7,808
Williams Fork
Williams Fork Dam
22
Cherry Creek Reservoir
Arapahoe
39°38′35″N 104°51′27″W / 39.64306°N 104.85750°W / 39.64306; -104.85750
[44]
95,960
[40]
0.1184
5,551
Cherry Creek
Cherry Creek Dam
23
Nee Noshe Reservoir
Kiowa
38°20′26″N 102°41′39″W / 38.34056°N 102.69417°W / 38.34056; -102.69417
[45]
94,850
[40]
0.1170
3,924
Arkansas River via inlet canal‡
Nee Noshe Dam
24
Ridgway Reservoir
Ouray
38°13′48″N 107°45′13″W / 38.23000°N 107.75361°W / 38.23000; -107.75361
[46]
84,230
[47]
0.1024
6,699
Uncompahgre River
Ridgway Dam
25
Cheesman Lake
Douglas ,
Jefferson
39°12′31″N 105°16′36″W / 39.20861°N 105.27667°W / 39.20861; -105.27667
[48]
79,060
[49]
0.0975
6,847
South Platte River
Cheesman Dam
26
North Sterling Reservoir
Logan
40°46′36″N 103°16′50″W / 40.77667°N 103.28056°W / 40.77667; -103.28056
[50]
74,590
[51]
0.0920
4,071
South Platte River via inlet canal‡
North Sterling Dam
27
Adobe Creek Reservoir
Bent ,
Kiowa
38°16′20″N 103°14′46″W / 38.27222°N 103.24611°W / 38.27222; -103.24611
[52]
70,000
[40]
0.0863
4,131
Adobe Creek via inlet canal‡
28
Wolford Mountain Reservoir
Grand
40°07′45″N 106°24′41″W / 40.12917°N 106.41139°W / 40.12917; -106.41139
[53]
65,985
[51]
0.0814
7,405
Muddy Creek (Colorado)
Wolford Mountain Dam
29
Riverside Reservoir
Weld
40°20′15″N 104°15′33″W / 40.33750°N 104.25917°W / 40.33750; -104.25917
[54]
65,008
[55]
0.0802
4,511
South Platte River via inlet canal
30
Platoro Reservoir
Conejos
37°20′32″N 106°33′23″W / 37.34222°N 106.55639°W / 37.34222; -106.55639
[56]
59,570
[57]
0.0735
9,977
Conejos River
Platoro Dam
31
Spinney Mountain Reservoir
Park
38°58′33″N 105°37′55″W / 38.97583°N 105.63194°W / 38.97583; -105.63194
[58]
53,873
[51]
0.0665
8,691
South Platte River
32
Rio Grande Reservoir
Hinsdale
37°43′10″N 107°16′50″W / 37.71944°N 107.28056°W / 37.71944; -107.28056
51,110
[40]
0.0630
9,400
Rio Grande
Rio Grande Dam
33
Boyd Lake
Larimer
40°25′39″N 105°01′55″W / 40.42750°N 105.03194°W / 40.42750; -105.03194
[59]
49,048
[55]
0.0605
4,961
Big Thompson River via inlet canal
Boyd Lake Dam
34
Two Buttes Reservoir
Baca ,
Prowers
37°38′07″N 102°33′03″W / 37.63528°N 102.55083°W / 37.63528; -102.55083
[60]
48,720
[40]
0.0601
4,232
Two Buttes Creek
Two Buttes Dam
35
Santa Maria Reservoir
Mineral
37°48′06″N 107°05′35″W / 37.80167°N 107.09306°W / 37.80167; -107.09306
[61]
43,500
[62]
0.0537
9,488
North Clear Creek via inlet canal
none
36
Homestake Reservoir
Pitkin County, Colorado ,
Eagle
39°21′43″N 106°27′59″W / 39.36194°N 106.46639°W / 39.36194; -106.46639
[63]
42,822
[64]
0.0528
10,266
Homestake Creek
Homestake Project Dam
37
Gross Reservoir
Boulder
39°57′00″N 105°21′38″W / 39.95000°N 105.36056°W / 39.95000; -105.36056
[65]
41,920
[55]
0.0517
7,290
South Boulder Creek
Gross Dam
38
Lemon Reservoir
La Plata
37°23′43″N 107°39′43″W / 37.39528°N 107.66194°W / 37.39528; -107.66194
[66]
39,792
[67]
0.0491
8,130
Florida River
Lemon Dam