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Flow report

New Mexico River Levels & Streamflow

As of Sep 27, 2026, New Mexico rivers are running at 504% of normal across 118 USGS gauges — the highest is 7,610 cfs on the Pecos R Abv Canon Del Uta Nr Colonias. Live discharge, gauge height, and percent-of-normal for every USGS streamgauge in New Mexico.

USGS gauges
118
State percent normal
504%
0%normal200%
Paddle runs
2
Updated
Sep 27
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Flow briefing · Sep 27, 2026

New Mexico river conditions today

Where rivers are running versus normal, what’s spiking and what’s coming — refreshed daily from USGS and NOAA.

Streamflow levels across New Mexico are currently 504% of normal, with the Pecos R Abv Canon Del Uta Nr Colonias reporting the highest discharge in the state at 7,610 cfs and a gauge stage of 11.93 ft.

Meanwhile, the Canadian River Near Taylor Springs is seeing a spike today — up 7644% since yesterday and currently running near peak.

Tap any gauge below for the full hydrograph, paired weather forecast, and historical context. Use the rivers panel to jump into New Mexico's named rivers.

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Active weather warnings for New Mexico

# New Mexico Storm Center Alert

New Mexico is under a statewide Flood Watch from September 27 through September 30 as a near-record surge of monsoonal moisture combined with two merging storm systems threatens the entire state. Moderate to heavy rainfall is expected across all regions, with already saturated ground conditions creating a high risk of flash flooding. Major cities and towns including Albuquerque, Santa Fe, Taos, Ruidoso, Farmington, Roswell, Clovis, and Las Vegas face significant flooding threats to low-lying areas, arroyo systems, and urban locations. Recent burn scars in the Ruidoso area and other burn scar regions are particularly vulnerable. Rivers and streams may rise to flood stage, and tropical moisture from Hurricane Polo will intensify rainfall in southern New Mexico. Residents should avoid flooded roadways and be prepared for rapidly changing conditions through late Tuesday night.

Source: National Weather Service

New Mexico vs normal

How New Mexico’s rivers compare to normal

Every gauge placed by its own percent of normal, and three years of the statewide trend.

Where every gauge actually sits

One dot per New Mexico streamgauge, placed by its own percent of normal. The state average is a single line through all of it.

State average 504%
0% 50% 100% · normal 150% 200%+
Much below normalunder 50% Below normal50–90% Near normal90–110% Above normal110–150% Much above normalover 150%

Percent of normal compares today's discharge with the historical average for this calendar day. Tap any dot to open that gauge.

New Mexico streamflow, three water years

Statewide percent of normal, every day since Sep 2023. The dotted line is normal.

504% of normal today
+444pts vs this day last year (60%)
265of 366 days below normal, past year
504% 3-year peak · Sep 2026 · above the axis
50% 100% normal 150%
Sep 2023 202420252026 Sep 27, 2026

799 daily readings from 112 reporting gauges. Percent of normal is today's statewide discharge against the historical average for the same calendar day — 100% is normal, not "good". The axis tops out at 175%: 11 readings above that — including the 504% peak in Sep 2026 — are drawn along the top edge, so a few flood days cannot flatten three years of everything else. The line breaks in 2 places where the record skips more than five days — those are gaps in reporting, not readings of zero.

New Mexico flow report

118 gauges
Streamgage Streamflow Gage height Water temp Air temp Elevation Watershed
Pecos River Near Lake Arthur, Nm
9 hours ago · USGS 08395500
4,030 cfs 15.99 ft · 59°F 3,335 ft Upper Pecos-Long Arroyo
San Juan River At Shiprock, Nm
9 hours ago · USGS 09368000
2,400 cfs 9.43 ft 61°F 49°F 4,894 ft Middle San Juan
San Juan River At Farmington, Nm
9 hours ago · USGS 09365000
2,050 cfs 3.07 ft 59°F 54°F 5,241 ft Middle San Juan
Animas River Below Aztec, Nm
9 hours ago · USGS 09364010
1,610 cfs 7.86 ft 53°F 52°F 5,560 ft Animas
Pecos River Near Artesia, Nm
9 hours ago · USGS 08396500
1,490 cfs 10.85 ft · 61°F 3,306 ft Upper Pecos-Long Arroyo
Animas River At Farmington, Nm
9 hours ago · USGS 09364500
1,470 cfs 6.20 ft 58°F 55°F 5,278 ft Animas
Rio Grande Floodway At San Acacia, Nm
8 hours ago · USGS 08354900
1,360 cfs 11.30 ft · 56°F 4,662 ft Rio Grande-Albuquerque
Rio Grande At Narrows In Elephant Butte Res., Nm
9 hours ago · USGS 08359500
1,130 cfs 6.57 ft · 59°F 4,416 ft Elephant Butte Reservoir
Pecos River (Kaiser Channel) Near Lakewood, Nm
9 hours ago · USGS 08399500
1,070 cfs 16.94 ft · 62°F 3,281 ft Upper Pecos-Black
Rio Grande At Isleta Lakes Nr Isleta, Nm
9 hours ago · USGS 08330875
638 cfs 5.14 ft · 50°F 4,899 ft Rio Grande-Albuquerque
Pecos R Abv Canon Del Uta Nr Colonias, Nm
9 hours ago · USGS 08382600
580 cfs 5.89 ft · 55°F 4,809 ft Pecos Headwaters
Pecos River Above Santa Rosa Lake, Nm
9 hours ago · USGS 08382650
547 cfs 7.47 ft · 56°F 4,761 ft Pecos Headwaters
Rio Grande Floodway At San Marcial, Nm
8 hours ago · USGS 08358400
465 cfs 13.84 ft · 56°F 4,484 ft Elephant Butte Reservoir
Rio Grande Conveyance Channel At San Marcial, Nm
9 hours ago · USGS 08358300
464 cfs 11.73 ft · 56°F 4,472 ft Rio Grande-Albuquerque
Rio Puerco Near Bernardo, Nm
9 hours ago · USGS 08353000
445 cfs 13.33 ft · 56°F 4,738 ft Rio Puerco
Rio Grande Below Cochiti Dam, Nm
9 hours ago · USGS 08317400
400 cfs 2.10 ft 70°F 55°F 5,230 ft Rio Grande-Santa Fe
Pecos River Near Anton Chico, Nm
9 hours ago · USGS 08379500
375 cfs 3.90 ft · 55°F 5,138 ft Pecos Headwaters
Pecos River Near Acme, Nm
8 hours ago · USGS 08386000
371 cfs 6.34 ft · 58°F 3,510 ft Upper Pecos-Long Arroyo
Pecos River At Pierce Canyon Crossing, Nm
8 hours ago · USGS 08407000
365 cfs 5.76 ft · 65°F 2,898 ft Upper Pecos-Black
Rio Grande At Otowi Bridge, Nm
9 hours ago · USGS 08313000
321 cfs 2.68 ft 65°F 48°F 5,503 ft Upper Rio Grande
Pecos River At Red Bluff, Nm
8 hours ago · USGS 08407500
319 cfs 4.99 ft 79°F 65°F 2,857 ft Upper Pecos-Black
Rio Grande Nr Alameda, Nm
9 hours ago · USGS 08329928
302 cfs 2.71 ft · 54°F 4,989 ft Rio Grande-Albuquerque
San Juan River Near Archuleta, Nm
9 hours ago · USGS 09355500
276 cfs 3.88 ft 53°F 49°F 5,665 ft Upper San Juan
Pecos River Near Dunlap, Nm
9 hours ago · USGS 08385630
256 cfs 1.37 ft · 56°F 3,755 ft Upper Pecos
Pecos River Near Malaga, Nm
9 hours ago · USGS 08406500
250 cfs 4.33 ft 53°F 64°F 2,915 ft Upper Pecos-Black
Rio Hondo Near Roswell, Nm
9 hours ago · USGS 08393610
247 cfs 9.63 ft · 57°F 3,520 ft Rio Hondo
Rio Grande Floodway Near Bernardo, Nm
9 hours ago · USGS 08332010
240 cfs 14.78 ft · 56°F 4,733 ft Rio Grande-Albuquerque
Rio Grande At Albuquerque, Nm
9 hours ago · USGS 08330000
225 cfs 2.75 ft 75°F 53°F 4,953 ft Rio Grande-Albuquerque
Pecos River Near Pecos, Nm
9 hours ago · USGS 08378500
199 cfs 3.01 ft · 48°F 7,506 ft Pecos Headwaters
Rio Grande At Embudo, Nm
9 hours ago · USGS 08279500
196 cfs 2.21 ft 64°F 49°F 5,793 ft Upper Rio Grande
Revuelto Creek Near Logan, Nm
9 hours ago · USGS 07227100
167 cfs 2.38 ft 75°F 59°F 3,671 ft Revuelto
Rio Grande Blw Taos Junction Bridge Near Taos, Nm
9 hours ago · USGS 08276500
163 cfs 3.48 ft · 42°F 6,079 ft Upper Rio Grande
Pecos River Below Taiban Creek Near Fort Sumner, Nm
8 hours ago · USGS 08385522
153 cfs 2.49 ft · 58°F 3,915 ft Upper Pecos
Gila River Near Gila, Nm
9 hours ago · USGS 09430500
149 cfs 1.68 ft · 60°F 4,661 ft Upper Gila
Rio Hondo Blw Diamond A Dam Nr Roswell, Nm
9 hours ago · USGS 08390800
138 cfs 2.76 ft · 58°F 3,962 ft Rio Hondo
Rio Penasco At Dayton, Nm
8 hours ago · USGS 08398500
133 cfs 2.53 ft · 60°F 3,402 ft Rio Penasco
Rio Chama Above Abiquiu Reservoir, Nm
9 hours ago · USGS 08286500
116 cfs 4.93 ft · 49°F 6,284 ft Rio Chama
Rio Chama Below El Vado Dam, Nm
9 hours ago · USGS 08285500
103 cfs 1.94 ft · 43°F 6,700 ft Rio Chama
Salt Creek Near Tularosa, Nm
8 hours ago · USGS 08480595
91 cfs 4.88 ft · 60°F 4,051 ft Tularosa Valley
Rio Hondo At Diamond A Ranch Nr Roswell, Nm
9 hours ago · USGS 08390500
90 cfs 6.60 ft · 58°F 4,214 ft Rio Hondo
Pecos River Near Puerto De Luna, Nm
8 hours ago · USGS 08383500
90 cfs 1.25 ft · 58°F 4,318 ft Pecos Headwaters
Gila River Near Redrock, Nm
9 hours ago · USGS 09431500
89 cfs 4.60 ft · 61°F 4,124 ft Upper Gila-Mangas
Rio Mora Near Terrero, Nm
9 hours ago · USGS 08377900
81 cfs 1.93 ft 48°F 43°F 7,898 ft Pecos Headwaters
Rio Ruidoso At Hollywood, Nm
8 hours ago · USGS 08387000
78 cfs 1.95 ft · 51°F 6,420 ft Rio Hondo
Gallinas Creek Near Montezuma, Nm
8 hours ago · USGS 08380500
76 cfs 2.04 ft 55°F 52°F 6,881 ft Pecos Headwaters
Santa Cruz River Near Cundiyo, Nm
8 hours ago · USGS 08291000
75 cfs 5.17 ft · 51°F 6,489 ft Upper Rio Grande
Rio Chama Near La Puente, Nm
8 hours ago · USGS 08284100
56 cfs 2.52 ft · 35°F 7,095 ft Rio Chama
Rio Ruidoso At Ruidoso, Nm
8 hours ago · USGS 08386505
53 cfs 2.03 ft · 48°F 7,101 ft Rio Hondo
Rio Grande Near Cerro, Nm
9 hours ago · USGS 08263500
44 cfs 1.20 ft · 38°F 7,117 ft Upper Rio Grande
Red River Below Fish Hatchery, Nm
8 hours ago · USGS 08266820
43 cfs 4.48 ft · 41°F 7,085 ft Upper Rio Grande
Pecos River Below Dark Canyon At Carlsbad, Nm
8 hours ago · USGS 08405200
43 cfs · 83°F 63°F 3,083 ft Upper Pecos-Black
Rio Pueblo De Taos Below Los Cordovas, Nm
9 hours ago · USGS 08276300
40 cfs 6.49 ft · 43°F 6,664 ft Upper Rio Grande
Rio Chama Near Chamita, Nm
9 hours ago · USGS 08290000
39 cfs 3.60 ft 62°F 48°F 5,666 ft Rio Chama
Gallinas R Nr Colonias, Nm
9 hours ago · USGS 08382500
39 cfs 3.43 ft · 55°F 4,946 ft Pecos Headwaters
Rio Chama Below Abiquiu Dam, Nm
9 hours ago · USGS 08287000
38 cfs 1.84 ft · 49°F 6,042 ft Rio Chama
Mora River Near Golondrinas, Nm
9 hours ago · USGS 07216500
38 cfs 1.62 ft · 45°F 6,758 ft Mora
Jemez River Near Jemez, Nm
8 hours ago · USGS 08324000
34 cfs 3.53 ft 77°F 53°F 5,637 ft Jemez
San Francisco River Near Glenwood, Nm
8 hours ago · USGS 09444000
27 cfs 2.29 ft · 56°F 4,557 ft San Francisco
Santa Fe R Abv Mcclure Res (8 Ft), Nm
9 hours ago · USGS 08315480
25 cfs 1.71 ft · 43°F 7,902 ft Rio Grande-Santa Fe
Canadian River Near Taylor Springs, Nm
9 hours ago · USGS 07211500
24 cfs 3.87 ft · 48°F 5,648 ft Upper Canadian
Red River Near Questa, Nm
9 hours ago · USGS 08265000
22 cfs 2.29 ft · 48°F 7,474 ft Upper Rio Grande
Black River Above Malaga, Nm
9 hours ago · USGS 08405500
21 cfs 1.53 ft · 64°F 3,086 ft Upper Pecos-Black
Gila River Below Blue Creek, Nm
10 hours ago · USGS 09432000
20 cfs 4.88 ft · 61°F 3,905 ft Upper Gila-Mangas
Mora River At La Cueva, Nm
9 hours ago · USGS 07215500
19 cfs 5.27 ft · 46°F 7,025 ft Mora
La Plata River At La Plata, Nm
9 hours ago · USGS 09367000
18 cfs 9.32 ft · 49°F 5,743 ft Middle San Juan
Rio Pueblo Nr Penasco, Nm
9 hours ago · USGS 08277470
17 cfs 3.24 ft · 40°F 7,800 ft Upper Rio Grande
Fourmile Draw Nr Lakewood, Nm
8 hours ago · USGS 08400000
14 cfs 3.11 ft · 61°F 3,323 ft Upper Pecos-Black
Embudo Creek At Dixon, Nm
8 hours ago · USGS 08279000
13 cfs 8.66 ft · 49°F 5,862 ft Upper Rio Grande
Gallinas River Near Lourdes, Nm
9 hours ago · USGS 08382000
12 cfs 1.66 ft · 50°F 5,940 ft Pecos Headwaters
Canadian River Near Sanchez, Nm
9 hours ago · USGS 07221500
11 cfs 1.15 ft · 57°F 4,429 ft Upper Canadian
Eagle Creek Below South Fork Near Alto, Nm
8 hours ago · USGS 08387600
11 cfs 6.78 ft · 48°F 7,621 ft Rio Hondo
Rio Hondo Near Valdez, Nm
9 hours ago · USGS 08267500
10 cfs 2.28 ft · 46°F 7,689 ft Upper Rio Grande
Tularosa Creek Near Bent, Nm
9 hours ago · USGS 08481500
9 cfs 2.09 ft · 56°F 5,448 ft Tularosa Valley
Tesuque Creek Above Diversions Near Santa Fe, Nm
9 hours ago · USGS 08302500
9 cfs 5.60 ft · 50°F 7,255 ft Upper Rio Grande
Rio Ojo Caliente At La Madera, Nm
9 hours ago · USGS 08289000
9 cfs 2.59 ft · 46°F 6,406 ft Rio Chama
La Plata River Near Farmington, Nm
8 hours ago · USGS 09367500
8 cfs 2.09 ft · 53°F 5,218 ft Middle San Juan
Mimbres River At Mimbres, Nm
9 hours ago · USGS 08477110
8 cfs · · 56°F 5,909 ft Mimbres
Santa Fe River Near Santa Fe, Nm
8 hours ago · USGS 08316000
8 cfs 1.68 ft · 43°F 7,717 ft Rio Grande-Santa Fe
Costilla Creek Near Costilla, Nm
8 hours ago · USGS 08255500
8 cfs 1.55 ft · 44°F 7,913 ft Upper Rio Grande
Costilla Creek Below Costilla Dam, Nm
9 hours ago · USGS 08254000
7 cfs 1.46 ft · 41°F 9,309 ft Upper Rio Grande
Rio Lucero Near Arroyo Seco, Nm
9 hours ago · USGS 08271000
6 cfs 1.78 ft · 45°F 8,071 ft Upper Rio Grande
Rio Penasco Near Dunken, Nm
9 hours ago · USGS 08397600
6 cfs 1.85 ft · 57°F 5,257 ft Rio Penasco
Rio Pueblo De Taos Near Taos, Nm
9 hours ago · USGS 08269000
6 cfs · · 49°F 7,402 ft Upper Rio Grande
Pecos R At Damsite 3 Nr Carlsbad, Nm
9 hours ago · USGS 08402000
5 cfs · · 62°F 3,184 ft Upper Pecos-Black
Cimarron River Near Cimarron, Nm
8 hours ago · USGS 07207000
4 cfs · · 50°F 6,628 ft Cimarron
Pecos River Below Avalon Dam, Nm
9 hours ago · USGS 08404000
4 cfs 3.86 ft · 63°F 3,118 ft Upper Pecos-Black
Rayado Creek Near Cimarron, Nm
8 hours ago · USGS 07208500
4 cfs 2.18 ft · 51°F 6,732 ft Cimarron
Canadian River At Logan, Nm
9 hours ago · USGS 07227000
4 cfs 1.42 ft · 59°F 3,665 ft Upper Canadian-Ute Reservoir
Dark Canyon At Carlsbad, Nm
9 hours ago · USGS 08405150
3 cfs 5.59 ft · 63°F 3,098 ft Upper Pecos-Black
Fort Sumner Main Canal Near Fort Sumner, Nm
1 day ago · USGS 08385000
3 cfs · · 58°F 4,053 ft Upper Pecos
Casias Creek Near Costilla, Nm
9 hours ago · USGS 08253000
3 cfs 3.22 ft · 40°F 9,419 ft Upper Rio Grande
Mogollon Creek Near Cliff, Nm
8 hours ago · USGS 09430600
3 cfs 1.37 ft · 59°F 5,421 ft Upper Gila
Eagle Tail Ditch Nr Maxwell, Nm
8 hours ago · USGS 07202500
3 cfs 1.44 ft · 49°F 6,108 ft Canadian Headwaters
Cimarron River Below Eagle Nest Dam, Nm
9 hours ago · USGS 07206000
2 cfs · · 31°F 8,058 ft Cimarron
Rio Nambe Below Nambe Falls Dam Near Nambe, Nm
9 hours ago · USGS 08294210
2 cfs · · 51°F 6,546 ft Upper Rio Grande
Galisteo Creek Below Galisteo Dam, Nm
8 hours ago · USGS 08317950
2 cfs 3.41 ft · 53°F 5,459 ft Rio Grande-Santa Fe
Rio Grande Del Rancho Near Talpa, Nm
9 hours ago · USGS 08275500
2 cfs 4.16 ft · 47°F 7,267 ft Upper Rio Grande
Santa Fe River Above Cochiti Lake, Nm
9 hours ago · USGS 08317200
2 cfs · · 54°F 5,512 ft Rio Grande-Santa Fe
Rio San Jose Near Grants, Nm
8 hours ago · USGS 08343500
1 cfs 1.95 ft · 49°F 6,269 ft Rio San Jose
Coyote Creek Near Golondrinas, Nm
9 hours ago · USGS 07218000
1 cfs 2.51 ft · 46°F 6,790 ft Mora
Costilla Creek Above Costilla Dam, Nm
9 hours ago · USGS 08252500
1 cfs 1.61 ft · 40°F 9,447 ft Upper Rio Grande
Vermejo River Near Dawson, Nm
8 hours ago · USGS 07203000
1 cfs 2.82 ft · 50°F 6,454 ft Canadian Headwaters
South Div Channel Abv Tijeras Arroyo Nr Albq., Nm
8 hours ago · USGS 08330775
1 cfs 1.06 ft · 52°F 4,959 ft Rio Grande-Albuquerque
Zuni River Abv Black Rock Reservoir, Nm
8 hours ago · USGS 09386950
1 cfs 2.36 ft · 46°F 6,482 ft Zuni
Santistevan Creek Near Costilla, Nm
9 hours ago · USGS 08253500
1 cfs · · 41°F 9,498 ft Upper Rio Grande
Pecos River Below Brantley Dam Near Carlsbad, Nm
9 hours ago · USGS 08401500
0 cfs 3.53 ft · 62°F 3,207 ft Upper Pecos-Black
Pecos River Below Sumner Dam, Nm
8 hours ago · USGS 08384500
0 cfs · · 58°F 4,149 ft Upper Pecos
Rio Nutria Near Ramah, Nm
8 hours ago · USGS 09386900
0 cfs 7.89 ft · 46°F 6,858 ft Zuni
North Floodway Channel Near Alameda, Nm
8 hours ago · USGS 08329900
0 cfs · · 55°F 5,014 ft Rio Grande-Albuquerque
Pecos River Below Santa Rosa Dam, Nm
9 hours ago · USGS 08382830
0 cfs 3.18 ft · 56°F 4,624 ft Pecos Headwaters
Ponil Creek Near Cimarron, Nm
9 hours ago · USGS 07207500
0 cfs · · 48°F 6,637 ft Cimarron
Ute Creek Near Logan, Nm
9 hours ago · USGS 07226500
0 cfs 4.11 ft · 59°F 3,816 ft Ute
Tijeras Arroyo Nr Albuquerque, Nm
8 hours ago · USGS 08330600
0 cfs 1.00 ft · 52°F 4,992 ft Rio Grande-Albuquerque
Rio Grande Below Elephant Butte Dam, Nm
9 hours ago · USGS 08361000
0 cfs · · 60°F 4,249 ft Caballo
Dark Canyon Draw Near Whites City, Nm
9 hours ago · USGS 08405105
0 cfs 3.57 ft · 65°F 3,445 ft Upper Pecos-Black
Carlsbad Main Canal At Head Near Carlsbad, Nm
9 hours ago · USGS 08403500
0 cfs 1.05 ft · 62°F 3,135 ft Upper Pecos-Black
Rocky Arroyo At Hwy Brd Nr Carlsbad, Nm
9 hours ago · USGS 08401900
0 cfs 3.22 ft · 62°F 3,258 ft Upper Pecos-Black
South Seven Rivers Nr Lakewood, Nm
8 hours ago · USGS 08401200
0 cfs 5.54 ft · 62°F 3,289 ft Upper Pecos-Black
Whitewater & paddle

New Mexico river runs

Paddleable river sections in New Mexico keyed to USGS gauges, with live streamflow and whitewater class.

River run Status Streamflow Air temp Class
Pilar/Race Course Too High 465 cfs 76°F III- TO IV-
Wilderness Run · · 62°F II TO III
Flow report FAQ

About New Mexico streamflow

What are river levels like in New Mexico right now?

As of September 27, 2026, New Mexico rivers are running at 504% of normal across 118 USGS streamgauges, and the Pecos R Abv Canon Del Uta Nr Colonias is reporting the highest discharge at 7,610 cfs. The full sortable gauge table is below.

Which New Mexico river is running highest right now?

As of September 27, 2026, the highest discharge in New Mexico is 7,610 cfs on the Pecos R Abv Canon Del Uta Nr Colonias. See the sortable gauge table for the full statewide ranking.

Are New Mexico rivers high or low right now?

Compare the statewide percent-of-normal on this page: above 100% means New Mexico rivers are running higher than the seasonal average for the date, below 100% means lower (a dry spell or drought). Each gauge also shows its own percent of median.

Where does the New Mexico streamflow data come from?

The U.S. Geological Survey National Water Information System. USGS streamgauges report continuously (every 15 minutes) and the data is the canonical real-time record for U.S. rivers. Snoflo pulls the latest readings and joins them to a 7-day NOAA weather forecast for each station.

What is cfs?

Cubic feet per second — the standard unit for streamflow. One cfs is about 7.5 gallons per second. Small creeks run at single-digit cfs; the Mississippi at hundreds of thousands.

What does Gauge Height mean?

The water level at the gauge in feet above the reference datum. Used together with discharge to track river state. Flood stage and runnable levels are typically expressed in gauge height (e.g., "flood at 16 ft").

How fresh is the New Mexico data?

USGS streamgauges report every 15 minutes; Snoflo re-pulls throughout the day. The AI briefing regenerates daily.

Can I get a flow alert for a New Mexico gauge?

Yes. Save any USGS gauge as a favorite in the Snoflo iOS app, set a discharge or stage threshold (e.g. "alert me when discharge crosses 2,000 cfs"), and you'll get a push the moment it crosses.

Is this a substitute for an NWS flood warning?

No. Snoflo is informational. For flood life-safety decisions always follow guidance from your local NWS forecast office and state emergency management. Snoflo data is one input among several.