How full Arizona’s reservoirs are right now, from the Colorado River lakes shared with six other states and Mexico to the Salt & Verde lakes that water the Valley. Keep scrolling for the aquifers, basin by basin.
| Reservoir | River | Full | Storage (af) | Capacity (af) | Elevation (ft) | 24h (af) |
|---|---|---|---|---|---|---|
| Colorado River | ||||||
| Lake PowellGlen Canyon Dam | Colorado | 21.1% | 5,141,246 | 24,322,000 | 3,517.83 | +8,802 |
| Lake MeadHoover Dam | Colorado | 26.1% | 6,829,740 | 26,120,000 | 1,037.84 | -2,040 |
| Lake MohaveDavis Dam | Colorado | 89.8% | 1,624,780 | 1,809,800 | 638.16 | +1,030 |
| Lake HavasuParker Dam | Colorado | 85.2% | 527,876 | 619,400 | 447.82 | +5,518 |
| System total | 26.7% | 14,123,642 | 52,871,200 | |||
| Salt & Verde (SRP) | ||||||
| Roosevelt LakeRoosevelt Dam | Salt | 36.0% | 594,607 | 1,653,043 | 2,087.48 | +8,502 |
| Apache LakeHorse Mesa Dam | Salt | 93.0% | 227,749 | 245,138 | 1,907.32 | +153 |
| Canyon LakeMormon Flat Dam | Salt | 58.0% | 33,441 | 57,852 | 1,631.76 | -1,165 |
| Saguaro LakeStewart Mountain Dam | Salt | 96.0% | 66,661 | 69,765 | 1,526.51 | -250 |
| Horseshoe LakeHorseshoe Dam | Verde | 20.0% | 21,372 | 109,217 | 1,981.91 | +160 |
| Bartlett LakeBartlett Dam | Verde | 82.0% | 145,311 | 178,186 | 1,785.47 | +394 |
| System total | 47.1% | 1,089,141 | 2,313,201 | |||
Sources: the U.S. Bureau of Reclamation’s Lower Colorado River operations (Lake Mead, Lake Mohave, Lake Havasu; readings 2026-09-29) and Upper Colorado hydrodata (Lake Powell), and SRP’s Daily Water Report (Salt & Verde reservoirs, today’s report). Percent full for the Colorado lakes is storage against full-pool capacity; SRP lakes use SRP’s own figure.
Everything above is surface water — about two-fifths of what Arizona uses each year is pumped from the ground, and outside the managed areas most basins have no pumping limit at all. There is no live gauge for an aquifer: ADWR crews measure wells in winter sweeps. Each well here is compared against itself a decade ago; a basin’s figure is the median of its wells. Negative means the water table fell.
These rows are ADWR’s groundwater basins, not city limits. Several take their name from the town at their center while covering hundreds of square miles around it — so each row also names the largest towns sitting over that aquifer, to find your own. Phoenix drinks from the West Salt River basin; Gilbert and Mesa from the East.
| Basin | Wells | Water is down (ft) | 10-yr change (ft) |
|---|---|---|---|
| Gila BendGila Bend · Theba | 15 | 375 | -57.8 |
| Douglas INADouglas · Bisbee · Pirtleville · Elfrida | 15 | 215 | -36.2 |
| DouglasDouglas · Bisbee · Pirtleville · Elfrida | 118 | 216 | -31.1 |
| WillcoxWillcox · Cochise · Sunizona · Dragoon | 152 | 313 | -27.7 |
| Harquahala INASunwest | 23 | 398 | -24.4 |
| San Simon ValleyBowie · San Simon · Paradise | 121 | 206 | -13.6 |
| EloyCasa Grande · Florence · Eloy · Coolidge | 107 | 241 | -13.4 |
| McMullen ValleySalome · Aguila · Wenden | 19 | 462 | -12.2 |
| San Rafael | 10 | 36 | -9.7 |
| Little Chino ValleyPrescott · Chino Valley | 57 | 240 | -9.6 |
| Rainbow Valley | 21 | 387 | -9.6 |
| Ranegras PlainBouse · Brenda · Vicksburg · Utting | 20 | 240 | -9.0 |
| Hualapai ValleyKingman · New Kingman-Butler · Valle Vista · Dolan Springs | 20 | 557 | -7.9 |
| Maricopa–StanfieldMaricopa · Komatke · Ak-Chin Village · Gila Crossing | 35 | 314 | -6.5 |
| HassayampaMorristown · Arlington · Wintersburg · Tonopah | 53 | 196 | -5.6 |
| Sierra VistaSierra Vista · Sierra Vista Southeast · Benson · Whetstone | 56 | 219 | -4.3 |
| Little Colorado RiverFlagstaff · Show Low · Winslow · Tuba City | 86 | 126 | -4.1 |
| WikieupPine Lake · Wikieup · Valentine · Crozier | 11 | 155 | -3.6 |
| Santa Cruz AMARio Rico · Nogales · Tubac · Arivaca Junction | 82 | 58 | -3.4 |
| Gila ValleySafford · Thatcher · Pima · Swift Trail Junction | 20 | 57 | -3.4 |
| MammothSan Manuel · Kearny · Mammoth · Dudleyville | 16 | 48 | -2.4 |
| Verde ValleyCamp Verde · Cottonwood · Verde Village · Sedona | 63 | 116 | -1.8 |
| Lake Pleasant | 10 | 184 | -1.7 |
| Sacramento ValleyGolden Valley · Walnut Creek · Lazy Y U · So-Hi | 18 | 422 | -1.6 |
| Upper Agua FriaPrescott Valley · Dewey–Humboldt | 30 | 218 | -1.6 |
| Big ChinoWilliamson · Paulden · Kaibab Estates West · Seligman | 76 | 128 | -1.5 |
| Fountain HillsFountain Hills · Rio Verde | 10 | 126 | -1.5 |
| Cienega CreekMescal · Patagonia · Sonoita · Pimaco Two | 46 | 92 | -1.4 |
| Wellton–MohawkWellton · Tacna · Yuma Proving Ground · Dateland | 22 | 166 | -1.1 |
| Tonto CreekStar Valley · Tonto Basin · Gisela · Round Valley | 14 | 74 | -0.6 |
| Skull ValleyWilhoit · Yarnell · Peeples Valley | 13 | 95 | -0.3 |
| Detrital ValleyWhite Hills | 11 | 475 | +0.1 |
| Avra ValleyMarana · Valencia West · Tucson Estates · Picture Rocks | 112 | 192 | +0.4 |
| Upper Santa CruzTucson · Casas Adobes · Catalina Foothills · Oro Valley | 156 | 173 | +0.6 |
| East Salt RiverMesa · Chandler · Gilbert · Scottsdale | 104 | 277 | +3.8 |
| West Salt RiverPhoenix · Glendale · Maryvale · Peoria | 131 | 173 | +11.0 |
| Verde CanyonPayson · Pine · Strawberry · Mesa del Caballo | 18 | 127 | +21.1 |
| Statewide | 2,009 | 194 | -4.3 |
Source: ADWR’s Groundwater Site Inventory (GWSI_ZIP_20260714, readings through 2026-07-08). Each well’s latest manual reading is paired with its own reading closest to 10 years earlier; basins are quoted only across 10+ such wells, so no median rides on a handful. Depth and change are medians, not means — one collapsing well shouldn’t swing its basin. Town lists are point-in-polygon against ADWR’s basin boundaries — a town spanning two basins is named under the one its center sits in.