Hydrohistorian
DB-118 CASTLE ROCK WELL 20
Monitored well · 152 · Division 1 · Water District 8
Its well permit here · Well permit at DWR ↗ · DWR structure record ↗ · Its structure dossier here · Download levels (CSV)
Denver Basin bedrock
Confined sandstone aquifer; negligible human-timescale recharge — pumping is one-way storage mining.
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
28 measurements from 1993-03-01 to 2026-03-27. Most recent water-level elevation 4873.0 ft, 1742.0 ft below ground.
Over the record the level is decreasing at -146.93 ft per decade (p = 0.0032, n = 27). 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, 1993-03-01 to 2026-03-27, 28 measurements. The record is decreasing at -146.93 feet per decade (p equals 0.0032), measured on water-level elevation. Rising elevation means more water. The values are downloadable as CSV from the link above.
The well itself
| Aquifer | ARAPAHOE |
|---|---|
| Designated basin | DENVER BASIN |
| Total depth | 2356.0 ft |
| Perforated interval | 1923.0–2356.0 ft |
| Ground elevation | 6615.0 ft |
| Permit | 25601 |
| Location | 39.36000, -104.92000 |
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.