Total Annual Flow of the Rio Grande
at the Otowi Bridge 1940–2025 · Thousands of Acre-Feet (KAF) · USGS Site 08313000

RIO GRANDE COMPACT KEY ACCOUNTING GAGE
RIO GRANDE COMPACT SIGNED 1938
DOWNLOADED MARCH 2026
Color-coded by magnitude tier  ·  1940–1974: USGS published annual totals  ·  1975–2025: calculated from USGS daily discharge records  ·  Dashed gold line = 1,000 KAF (1 MAF)
1,501–2,500 KAF — High
1,201–1,500 — Good
751–1,200 — Average
501–750 — Dry
≤ 500 — Very Low
1,000 KAF (1 MAF)
◦ lighter / dashed top = USGS published annual totals (1940–1974)
1940–1974: Annual flow totals as reported by the USGS in published annual water-data summaries; not calculated from daily records in this analysis.   1975–2025: Calculated from USGS NWIS daily mean discharge records (parameter 00060) at site 08313000; CFS × 1.9835 AF/day summed to calendar-year totals.   The 1956 value (256 KAF) is the record minimum in this dataset. 2025 reflects the full calendar year.   Source: USGS NWIS Site 08313000  ·  Rio Grande Compact Commission  ·  Downloaded March 2026.