Hydrohistorian
NHP-CY-033 ALLISON
Monitored well · 602 · Division 1 · Water District 65
Its well permit here · Well permit at DWR ↗ · DWR structure record ↗ · Its structure dossier here · Download levels (CSV)
High Plains / Ogallala
Effectively non-recharging in eastern Colorado; declines are storage depletion, a separate ledger line.
Because this aquifer does not recharge on a human timescale, a decline here is storage being removed, not a stream being short. It is kept out of the stream-depletion math for that reason.
Water-level record
29 measurements from 1999-02-03 to 2026-02-10. Most recent water-level elevation 3670.67 ft, 198.0 ft below ground.
Over the record the level is decreasing at -7.34 ft per decade (p = 0.0, n = 29). Mann–Kendall with the Hamed–Rao autocorrelation correction, on water-level elevation; rising elevation means more water.
Chart: water level at this well over time, 1999-02-03 to 2026-02-10, 29 measurements. The record is decreasing at -7.34 feet per decade (p equals 0.0), measured on water-level elevation. Rising elevation means more water. The values are downloadable as CSV from the link above.
The well itself
| Aquifer | OGALLALA |
|---|---|
| Designated basin | NORTHERN HIGH PLAINS |
| Total depth | 400.0 ft |
| Perforated interval | 240.0–400.0 ft |
| Ground elevation | 3868.67 ft |
| Reported yield | 800.0 gpm |
| Permit | 9533 |
| Location | 39.95000, -102.27000 |
What this page is not
Monitoring records are irregular: measurements cluster where somebody chose to look, so a trend describes this well's record, not the aquifer as a whole. Levels are DWR's published measurements, unedited. A trend here is not a prediction, and it is not a determination about anyone's water right.