Rio Grande Region HUC 13
The Rio Grande Region hydrologic region spans Colorado, New Mexico, Texas and is divided into 74 HUC8 sub-basins. Conditions are the US Drought Monitor's weekly area coverage and the day-of-year streamflow percentiles of the USGS gauges inside each sub-basin, as of 2026-09-07.
Health score
58
Moderate
Drought index
241
Severe
Area in D2+
48.6%
34 sub-basins ≥50%
Gauges below normal
75%
of 122 reporting
Water assets
71,070
avg WIS 54.1
Sub-basins
74
1,650 alerts · 25,243 transfers
quality 54drought 52streamflow 36regulatory 98coverage 71
Sub-basins, driest first
| Sub-basin | Assets | Avg WIS | Drought | Gauges low | Flow pct | Health |
|---|---|---|---|---|---|---|
| Rio Grande-Santa Fe 13020201 · NM | 3,177 | 53.1 | Exceptional (448) | 71% | p10 | 34 |
| Rio Chama 13020102 · CO, NM | 3,240 | 62.3 | Exceptional (447) | 75% | p8 | 33 |
| Saguache 13010004 · CO | 1,675 | 60.3 | Exceptional (440) | — | — | 36 |
| San Luis 13010003 · CO | 2,795 | 52 | Exceptional (436) | — | — | 32 |
| Western Estancia 13050001 · NM | 1,134 | 46.2 | Exceptional (427) | — | — | 30 |
| Alamosa-Trinchera 13010002 · CO, NM | 2,900 | 60.2 | Exceptional (423) | — | — | 38 |
| Upper Rio Grande 13020101 · CO, NM | 4,578 | 60.3 | Exceptional (420) | 95% | p6 | 29 |
| Eastern Estancia 13050002 · NM | 29 | 45.4 | Exceptional (412) | — | — | 31 |
| Pintada Arroyo 13060002 · NM | 216 | 56.2 | Exceptional (407) | — | — | 37 |
| Pecos Headwaters 13060001 · NM | 2,418 | 60.5 | Exceptional (405) | 70% | p10 | 40 |
| Conejos 13010005 · CO, NM | 1,272 | 63.8 | Exceptional (401) | — | — | 42 |
| Jemez 13020202 · NM | 1,269 | 59.4 | Exceptional (400) | 100% | p9 | 33 |
| Rio Grande Headwaters 13010001 · CO | 2,485 | 66.3 | Extreme (388) | — | — | 44 |
| Gallo Arroyo 13060006 · NM | 25 | 44.4 | Extreme (388) | — | — | 33 |
| Rio Puerco 13020204 · NM | 1,401 | 58.9 | Extreme (381) | 100% | p10 | 39 |
| Arroyo Chico 13020205 · NM | 1,176 | 57 | Extreme (350) | — | — | 44 |
| Rio Grande-Albuquerque 13020203 · NM | 5,524 | 51.9 | Extreme (344) | 87% | p10 | 36 |
| Taiban 13060004 · NM | 870 | 47.5 | Extreme (331) | — | — | 41 |
| Arroyo Del Macho 13060005 · NM | 811 | 57.8 | Extreme (328) | — | — | 46 |
| Rio Penasco 13060010 · NM | 739 | 58.1 | Extreme (327) | 100% | p10 | 39 |
| Rio Felix 13060009 · NM | 419 | 55.6 | Extreme (313) | — | — | 46 |
| Upper Pecos 13060003 · NM | 1,953 | 51 | Extreme (309) | 80% | p23 | 44 |
| Rio Hondo 13060008 · NM | 1,878 | 52.1 | Extreme (309) | 63% | p15 | 49 |
| Jornada Del Muerto 13020210 · NM | 293 | 47.9 | Extreme (300) | — | — | 44 |
| Playas Lake 13030201 · MX, NM | 862 | 51.8 | Severe (298) | — | — | 46 |
| Upper Pecos-Black 13060011 · NM, TX | 2,094 | 47.7 | Severe (285) | 59% | p22 | 49 |
| Cibolo-Red Light 13040201 · MX, TX | 305 | 42.3 | Severe (281) | — | — | 43 |
| Upper Pecos-Long Arroyo 13060007 · NM | 2,846 | 48.8 | Severe (270) | 100% | p23 | 44 |
| Jornada Draw 13030103 · NM | 228 | 44.9 | Severe (268) | — | — | 46 |
| Elephant Butte Reservoir 13020211 · NM | 742 | 54.4 | Severe (267) | 100% | p0 | 35 |
| Black Hills-Fresno 13040203 · MX, TX | 95 | 49.7 | Severe (267) | — | — | 48 |
| Rio San Jose 13020207 · NM | 2,796 | 53.2 | Severe (266) | 100% | p8 | 35 |
| Caballo 13030101 · NM | 1,883 | 58.6 | Severe (265) | 100% | p0 | 37 |
| Lower Rio Grande 13090002 · MX, TX | 468 | 50.9 | Severe (263) | — | — | 49 |
| Tularosa Valley 13050003 · NM, TX | 2,116 | 49.6 | Severe (250) | 33% | p31 | 55 |
| Rio Salado 13020209 · NM | 942 | 57.8 | Severe (249) | — | — | 54 |
| International Falcon Reservoir 13080003 · MX, TX | 251 | 44.9 | Severe (235) | — | — | 49 |
| Big Bend 13040205 · MX, TX | 35 | 44.3 | Severe (224) | 100% | p3 | 35 |
| Plains of San Agustin 13020208 · NM | 652 | 45.1 | Severe (223) | — | — | 50 |
| Salt Basin 13050004 · NM, TX | 1,402 | 49.3 | Severe (220) | — | — | 53 |
| Mimbres 13030202 · MX, NM | 3,364 | 48.4 | Severe (208) | 0% | p33 | 67 |
| Alamito 13040202 · MX, TX | 30 | 45.2 | Severe (206) | — | — | 52 |
| Rio Grande-Fort Quitman 13040100 · MX, NM, TX | 588 | 47.2 | Severe (204) | — | — | 53 |
| North Plains 13020206 · NM | 491 | 51.9 | Severe (200) | — | — | 56 |
| Los Olmos 13090001 · MX, TX | 227 | 51 | Severe (200) | — | — | 55 |
| Delaware 13070002 · NM, TX | 213 | 56.1 | Severe (200) | — | — | 58 |
| Salt Draw 13070004 · TX | 227 | 46.1 | Moderate (189) | — | — | 54 |
| Terlingua 13040204 · TX | 35 | 43.5 | Moderate (187) | — | — | 53 |
| Lower Pecos-Red Bluff Reservoir 13070001 · NM, TX | 297 | 55.7 | Moderate (186) | 33% | p52 | 65 |
| Reagan-Sanderson 13040208 · MX, TX | 40 | 49.9 | Moderate (183) | — | — | 57 |
| Lozier Canyon 13040210 · MX, TX | 15 | 41.5 | Moderate (169) | — | — | 54 |
| Barrilla Draw 13070005 · TX | 89 | 44.1 | Moderate (145) | 100% | p10 | 51 |
| San Francisco 13040209 · TX | 14 | 41.5 | Moderate (145) | — | — | 56 |
| El Paso-Las Cruces 13030102 · MX, NM, TX | 2,661 | 49.9 | Moderate (142) | — | — | 61 |
| Toyah 13070003 · TX | 153 | 46.2 | Moderate (142) | 50% | p47 | 54 |
| Santiago Draw 13040207 · TX | 13 | 45.8 | Moderate (133) | — | — | 60 |
| Landreth-Monument Draws 13070007 · NM, TX | 1,527 | 44.3 | Moderate (129) | — | — | 59 |
| Maravillas 13040206 · TX | 26 | 44.8 | Moderate (128) | — | — | 60 |
| San Ambrosia-Santa Isabel 13080002 · MX, TX | 477 | 46.8 | Moderate (127) | 0% | p76 | 68 |
| Big Canyon 13040211 · TX | 12 | 42.6 | Moderate (111) | — | — | 60 |
| Coyanosa-Hackberry Draws 13070006 · TX | 95 | 43.5 | Moderate (107) | — | — | 61 |
| Amistad Reservoir 13040212 · MX, TX | 13 | 43.8 | Moderate (103) | — | — | 62 |
| Pecos 13070008 · TX | 50 | 43 | Abnormally dry (91) | 100% | p19 | 54 |
| Lower Pecos 13070012 · TX | 19 | 44.3 | Abnormally dry (90) | — | — | 63 |
| Lower Devils 13040302 · TX | 39 | 42.5 | Abnormally dry (78) | 100% | p5 | 44 |
| Independence 13070010 · TX | 15 | 48.5 | Abnormally dry (78) | 0% | p48 | 77 |
| Tunas 13070009 · TX | 58 | 43 | Abnormally dry (73) | — | — | 64 |
| Howard Draw 13070011 · TX | 5 | 41.2 | Abnormally dry (20) | — | — | 69 |
| Upper Devils 13040301 · TX | 51 | 51.7 | Abnormally dry (10) | — | — | 75 |
| Dry Devils 13040303 · TX | 3 | 42 | Abnormally dry (5) | — | — | 70 |
| Elm-Sycamore 13080001 · MX, TX | 223 | 47 | Abnormally dry (4) | 0% | p83 | 77 |
| Rio Conchos 13100000 · MX | 4 | 51 | no data | — | — | 51 |
| Rio San Juan 13120000 · MX | 2 | 39 | no data | — | — | 39 |
| Rio Salado 13110000 · MX | 0 | — | no data | — | — | — |
Top water assets in this region
- 80Edwards-Trinity Aquifer — Permian Basin RegionBarrilla Draw
- 80Santa Fe Group Deep Fossil Aquifer — Albuquerque BasinRio Grande-Albuquerque
- 77Roswell Artesian Basin Aquifer — Pecos ValleyRio Hondo
- 76Hueco Bolson Fossil Aquifer — El PasoRio Grande-Fort Quitman
- 76Roswell Artesian Basin Fossil AquiferRio Hondo
- 70Nichols DamRio Grande-Santa Fe
- 70San Mateo Lake DamRio San Jose
- 70Alberta ParkRio Grande Headwaters
- 70Santa Cruz Site 1 DamUpper Rio Grande
- 70Lower Vallecito DamJemez