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Brazos basin · Brazos G · East Texas
TWDB reading Oct 23, 2026
USGS 08111058 — Gibbons Ck Res nr Shiro, TX
Extrapolated from the past 60 days
Falling roughly 23 acre-feet per day. At that rate the conservation pool would be exhausted in about 2.6 years.
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 Grimes County, Oct 20, 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 9 years of record for this date
At 86%, Gibbons Creek Reservoir is within its normal range for this date, higher than 68% of years on record.
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.