1508.03 ft project datum (matches CDEC gauge)
level 7.0 ft below full pool — unusually high for late September
Reading comes from California DWR — California Data Exchange Center (CDEC station CAS) by way of our own server, which asks the agency each time you load this page and passes on its figure in the agency's own datum, unchanged. Most of these reservoirs report every hour and a few report once a day, so the stamp beside the reading is a time of day for some lakes and a date for others — whichever CDEC put on it. For everything else the agency publishes about this reservoir, go to Castaic Lake at CDEC.
Is Castaic Lake full?
Not quite — 7.0 ft below full pool as of September 23, 2026
How full is Castaic Lake? Not as a percentage: no storage figure comes through with this gauge reading, and a share of capacity worked out from the elevation alone would be a guess — how much water a reservoir holds at a given level is a curve only the operator's own capacity table knows. Feet from full pool is what the operator publishes, and it is the figure above.
Castaic Lake through the year
The band is the lake's own normal: where the level has run on each calendar day, 2007–2026. The summer drawdown — and how this year sits in it — shows up without reading a single number.
This year vs the years that matter
This year's trace against last year and the driest and wettest years on record — the drought-context question every lake regular asks.
- 2026 (this year)
- 2025 (last year)
- 2011 (wettest on record)
- 2015 (driest on record)
Full pool, datum, and the gauge
"Full pool" here means the conservation pool — the level the lake is designed to hold for water supply and recreation, not the flood-control space above it. The full explainer covers flood pool and dead pool too.
| Full pool | 1515.00 ft project datum (matches CDEC gauge) · per CA DWR (State Water Project) full-pool reference |
|---|---|
| Conservation capacity | 325,000 acre-feet · per CA DWR (State Water Project) capacity reference |
| Gauge | CDEC station CAS · California DWR — California Data Exchange Center |
| Datum | project datum (matches CDEC gauge) — 'Maximum water elevation of 1,515 ft' (Wikipedia Castaic Dam, cited to DWR/CDEC — tertiary; DWR pages do not publish the figure). Dam crest 1,535 (CDEC dam profile). |
| Last verified | August 15, 2026 |
LakeDates reports lake level, not ramp status. Whether a given ramp or marina is usable at this level varies ramp by ramp — call the marina before you tow.
Quick answers
What is the lake level for Castaic Lake today?
Castaic Lake is at 1508.03 ft (project datum (matches CDEC gauge)) as of September 23, 2026 — 7.0 ft below full pool — unusually high for late September.
Is Castaic Lake full?
Not quite — at 1508.03 ft on September 23, 2026, Castaic Lake is 7.0 ft below its full pool of 1515.00 ft (project datum (matches CDEC gauge)).
How full is Castaic Lake?
Not as a percentage: no storage figure comes through with this gauge reading, and a share of capacity worked out from the elevation alone would be a guess — how much water a reservoir holds at a given level is a curve only the operator's own capacity table knows. Feet from full pool is what the operator publishes, and it is the figure above.
What is full pool for Castaic Lake?
Full pool (the conservation pool) for Castaic Lake is 1515.00 ft project datum (matches CDEC gauge), per CA DWR (State Water Project) full-pool reference. Levels above it use flood storage; levels below it are drawdown.