# New Flood Watches Cover Upper Rio Grande and San Luis Valley New NWS watches anticipate heavy-rain and snowmelt flooding along the Rio Grande and Conejos River from late Saturday into early next week. By Will Langan | 24X7 News Published: 2026-10-25T23:56:00.428Z Updated: 2026-10-31T20:13:34.723Z Section: U.S. Format: News Canonical: https://24x7news.us/articles/rio-grande-alamosa-flood-warning-october-25-2026 Update, October 31, 1:59 p.m. MDT: New flood watches cover the upper Rio Grande basin and western San Luis Valley as forecasters anticipate another period of heavy rain and mountain runoff. The National Weather Service in Pueblo issued a watch for the Eastern San Juan Mountains and Upper Rio Grande Valley from late Saturday night through Monday morning, November 2. The bulletin identifies the Conejos River and South Fork of the Rio Grande, including South Fork and Mogote, as the areas of greatest concern. Heavy rain Sunday and Monday is expected to affect ground that has recently received excessive moisture or experienced flooding. Forecasters also warn of possible rockslides in mountain areas and say Highways 160 and 17 are likely to be significantly affected by the storm. A separate watch covers the western half of the San Luis Valley from Sunday afternoon through late Tuesday night, November 3. Named communities include Antonito, Del Norte, Monte Vista and Alamosa. That notice says runoff from heavy rain and melting snow in the San Juan Mountains may cause flooding as high water moves through the Rio Grande and Conejos River, particularly Monday and Tuesday. The October 31 bulletins concern anticipated flooding. They do not supply a new Alamosa river-gauge reading or extend the October 27 warnings recorded below. Those earlier observations and expiration times remain historical context. Earlier Reporting and Update History — October 25–27 Conditions: Update, October 27, 5:03 p.m. CDT: The National Weather Service extended the flood warning until 5:45 p.m. MDT Tuesday for northeastern Conejos, west-central Costilla, southeastern Rio Grande and southwestern Alamosa counties. The Pueblo office’s 3:10 p.m. MDT bulletin reported that flooding was still occurring at 2:59 p.m., especially in low-lying areas near the Rio Grande and Conejos River. Agricultural fields and wetlands remained inundated, with standing or slow-moving water over many roads. The agency urged motorists to avoid flooded roads. Earlier Reporting and Update History (Historical Conditions): Update, October 27, 3:01 p.m. CDT: The National Weather Service extended the flood warning until 3:45 p.m. MDT Tuesday for northeastern Conejos, west-central Costilla, southeastern Rio Grande and southwestern Alamosa counties. The Pueblo office’s 1:19 p.m. MDT bulletin said flooding continued along and near the Rio Grande and Conejos River. Low-lying areas remained flooded at 1:14 p.m., with agricultural fields and wetlands inundated and standing or slow-moving water over many roads. The agency urged motorists to avoid flooded roads. Earlier Reporting and Update History (Historical Conditions): Update, October 27, 10:11 a.m. CDT: The National Weather Service extended an area flood warning until 1:45 p.m. MDT Tuesday for northeastern Conejos, west-central Costilla, southeastern Rio Grande and southwestern Alamosa counties. Its 8:48 a.m. MDT bulletin reported that low-lying flooding was still occurring at 8:42 a.m., with agricultural fields, wetlands and other low ground inundated. This extension concerns an area warning with its own boundaries and expiration time. It does not establish a new river-gauge reading or recession forecast. The observations, forecasts and warning times in the earlier reporting below are historical; they should not be read as current conditions. Earlier Reporting and Update History: Update, October 26, 6:15 p.m. CDT: NWS reports Conejos River crests at most locations; Manassa remains flooded. Warning expires 1:15 a.m. MDT Tuesday. The Rio Grande at Alamosa, Colorado, stood at 9.8 feet at 8:30 a.m. Mountain on Monday, October 26, remaining above its 9-foot flood stage, the National Weather Service reported. The agency listed a 24-hour maximum of 9.9 feet. The Pueblo office’s 9:33 a.m. statement extended the river warning until 4 p.m. Mountain Tuesday, October 27. It now forecasts the river will fall below flood stage late Monday night, earlier than the previous Tuesday-morning forecast. The agency continues to describe the flooding as minor. The National Weather Service issued a new flood warning for southeastern Rio Grande and west-central Alamosa counties until 12:45 a.m. Mountain on Tuesday, October 27. The Pueblo office’s 11:43 p.m. Sunday bulletin reported high stream flows and ongoing flooding, including widespread inundation of agricultural fields, wetlands and other low-lying areas. A new warning for southeastern Conejos County runs until 1:15 a.m. Mountain Tuesday, October 27. The agency’s 1:08 a.m. Monday bulletin reported elevated water levels near Manassa and flooding ongoing or expected shortly, with agricultural fields, wetlands and other low-lying land inundated. Named communities include Manassa, Sanford, Antonito, Romeo, Conejos, Bountiful and Ortiz. These area warnings have different boundaries and expiration times from the separate river-gauge warning at Alamosa. Update, October 25, 10:05 p.m. CDT: Added the Conejos warning extension. Further update, October 25: Added the 9:08 p.m. Mountain extension for flooding between Monte Vista and Alamosa. These warnings cover different locations and have different expiration times. Update, October 26: Replaced the earlier area-warning times with the new 11:43 p.m. Mountain warning and the 10:47 p.m. Conejos extension. Update, October 26, 3:08 a.m. CDT: Added the new Conejos warning through early Tuesday, replacing the warning that had been due to expire early Monday. Update, October 26: Added the 2:30 a.m. Mountain observation of 9.9 feet and the revised 10-foot crest forecast from the 2:48 a.m. bulletin. Earlier forecasts were lower. Update, October 26, 11:03 a.m. CDT: Added the 8:30 a.m. Mountain reading of 9.8 feet, the revised forecast for a fall below flood stage late Monday night and the river-warning extension through 4 p.m. Mountain Tuesday. The earlier 10-foot crest was a forecast; the latest bulletin lists a 9.9-foot observed maximum. Sources NWS Pueblo — October 27, 3:10 p.m. MDT extension and earlier bulletins: https://www.weather.gov/wwamap/wwatxtget.php?cwa=pub&wwa=all NWS Pueblo — October 31 Upper Rio Grande and Eastern San Juan Flood Watch: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.a86d832769b4b479ba2fd2815cb3755bcf6b1d9a.001.1 NWS Pueblo — October 31 San Luis Valley Flood Watch: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.a86d832769b4b479ba2fd2815cb3755bcf6b1d9a.002.1 ## Sources - NWS Pueblo — October 27, 3:10 p.m. MDT extension and earlier bulletins: https://www.weather.gov/wwamap/wwatxtget.php?cwa=pub&wwa=all - NWS Pueblo — October 31 Upper Rio Grande and Eastern San Juan Flood Watch: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.a86d832769b4b479ba2fd2815cb3755bcf6b1d9a.001.1 - NWS Pueblo — October 31 San Luis Valley Flood Watch: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.a86d832769b4b479ba2fd2815cb3755bcf6b1d9a.002.1 - Image — Michael S. Kohn / USGS; Rio Grande at Alamosa NWR; Archive; Public Domain: https://www.usgs.gov/media/images/08223400-rio-grande-alamosa-nwr-near-alamosa-co-1