St. Vrain HUC8 10190005
A 2,539 km² sub-basin of the Missouri region in CO. Drought coverage is from the US Drought Monitor (map of 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
25
Critical
Drought index
429
Exceptional
Area in D2+
100%
32.56% exceptional (D4)
Gauges below normal
100%
of 4 reporting
Median flow
26%
p6 of record
Water assets
2,858
182 springs · 1,521 wells
USGS gauges (8)
- LEFT HAND CREEK AT HOVER ROAD NEAR LONGMONT, CO067249701 cfsp4 · much below normal
- BOULDER CREEK AT MOUTH NEAR LONGMONT, CO067305001 cfsp5 · much below normal
- ST VRAIN CR BLW BOULDER CR AT HWY 119 NR LONGMONT0673052542 cfsp6 · much below normal
- BOULDER CREEK AT NORTH 75TH ST. NEAR BOULDER, CO0673020019 cfsp17 · below normal
- FOURMILE CREEK AT LOGAN MILL ROAD NEAR CRISMAN, CO06727410no readingno long-term record
- FOURMILE CREEK AT ORODELL, CO06727500no readingno long-term record
- FOURMILE CANYON CREEK NEAR SUNSHINE, CO067301600 cfsno long-term record
- COAL CREEK NEAR LOUISVILLE, CO067304000 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-21 | 429 | 100 | 4/4 | p6 |
| 2026-10-20 | 429 | 100 | 4/4 | p8 |
| 2026-10-19 | 429 | 100 | 4/4 | p12 |
| 2026-10-18 | 429 | 100 | 4/4 | p12 |
| 2026-10-17 | 429 | 100 | 3/4 | p17 |
| 2026-10-16 | 429 | 100 | 3/4 | p17 |
| 2026-10-15 | 429 | 100 | 1/4 | p70 |
| 2026-10-14 | 429 | 100 | 4/4 | p9 |
| 2026-10-13 | 429 | 100 | 4/4 | p7 |
| 2026-10-12 | 429 | 100 | 4/4 | p8 |
| 2026-10-11 | 429 | 100 | 4/4 | p7 |
| 2026-10-10 | 429 | 100 | 4/4 | p8 |
| 2026-10-09 | 429 | 100 | 4/4 | p7 |
| 2026-10-08 | 405 | 100 | 3/4 | p5 |
Top water assets
- 78Harrison Res — South Platte Riverwell
- 76Sandstone Ridge Ditch — South Platte Riverwell
- 76Mayer Well 1-14378 — Groundwater: South Platte Riverwell
- 76Nishimoto Well 1-15398 — Groundwater: South Platte Riverwell
- 76Yamaguchi Well 3-13988R — Groundwater: South Platte Riverwell
- 76Nishimoto Well 3-5503F — Groundwater: South Platte Riverwell
- 76Mayer Well 1-2881-F — Groundwater: South Platte Riverwell
- 73Nishimoto Well 4-12016 — Groundwater: South Platte Riverwell
- 73Nishimoto Well 3-12015 — Groundwater: South Platte Riverwell
- 73Mayer Well 2-13777 — Groundwater: South Platte Riverwell