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Red basin · Panhandle · Low Rolling Plains
TWDB reading Sep 8, 2026
USGS 07299840 — Greenbelt Lk nr Clarendon, TX
Extrapolated from the past 60 days
Falling roughly 11 acre-feet per day. At that rate the conservation pool would be exhausted in about 288 days.
A straight-line extrapolation, not a forecast. It assumes the recent rate continues unchanged, ignoring seasonality, rainfall and managed releases — and drawdown normally slows as a reservoir falls. Treat it as a severity signal, not a date.
US Drought Monitor for Donley County, Sep 1, 2026
Conditions in the county containing the dam. A reservoir is filled by a watershed that often reaches well beyond one county, and releases are managed, so local drought is context rather than an explanation of the level.
Nearest gaged reaches above and below the dam
How today compares with 59 years of record for this date
At 5%, Greenbelt Lake is near its lowest on record for this date — below 99% of all years since 1967. It was last this low in 1967.
Percentiles pool the ±3 days around today across every year on record, so “normal” means normal for this time of year. Conservation capacity is re-surveyed over time, so percent-full comparisons across decades are close but not exact.
Daily TWDB observations, with the normal range for each date
Normal range for the date (25th–75th percentile)Median year
Past 7 days, typically 15-minute readings. USGS elevations use a published datum that may differ slightly from the TWDB daily value above.