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Flood-frequency data are based on recorded annual peak discharges
through 1998. Peak discharges for specified frequencies (exceedance
probabilities) were determined by fitting a log-Pearson Type 3
probability distribution to base 10 logarithms of recorded annual peak
discharges as described by the Interagency Advisory Committee on Water Data
(1982, Guidelines for Determining Flood Flow Frequency--Bulletin 17-B of
the Hydrology Subcommittee: U.S. Geological Survey, Office of Water Data
Coordination).
Note: Data are provisional and user
is responsible for assessment and interpretation of flood-frequency data.
Most of the basin characteristic data were measured in the 1970s from the best-scale topographic maps available at the time. Some data, such as mean annual precipitation, soil index data, and mean January minimum temperatures, were compiled from maps prepared by other agencies. Channel widths were measured in the field by USGS personnel. For more detailed information contact Charles Parrett: Phone: 406-457-5928 or by e-mail. |
| [Abbreviations: ab, above; bl, below; CLWIC, Cypress Lake West Inflow Canal; Cr, Creek; Div, diversion; E F, East Fork; E I P, Easter Irrigation Project; Fk, Fork; Int Bndry, International Boundary; M F, Middle Fork; N F, North Fork; no., number; R, River; Re, Reservoir; RS, Ranger Station; Sask, Saskatchewan; SBRS, Spotted Bear Ranger Station; Serv Bdry, Service Boundary; S F, South Fork; trib, tributary; W F West Fork; YNP, Yellowstone National Park] |
HUDSON BAY BASIN MISSOURI RIVER BASIN--Headwaters to Toston, MT MISSOURI RIVER BASIN--Toston, MT to Ulm, MT MISSOURI RIVER BASIN--Ulm, MT to Loma, MT MISSOURI RIVER BASIN--Loma, MT to Ft Peck, MT MISSOURI RIVER BASIN--Milk River Basin MISSOURI RIVER BASIN--Ft. Peck, MT to North Dakota Border YELLOWSTONE RIVER BASIN--Yellowstone National Park to Billings, MT YELLOWSTONE RIVER BASIN--Billings, MT to Miles City, MT YELLOWSTONE RIVER BASIN--Miles City, MT to Sidney, MT UPPER COLUMBIA RIVER BASIN--Kootenai River Basin UPPER COLUMBIA RIVER BASIN--Clark Fork Basin to St. Regis, MT UPPER COLUMBIA RIVER BASIN--Flathead River Basin to Idaho Border