Hydrology

Observed river flow, snowpack and official streamflow and water-supply forecasts: the water behind hydropower generation.

8 datasetspublished by ATG DataUS reference8

Hydrology datasets
Dataset	Cadence	Rows
ECCC Daily Mean Hydrometric (Columbia)ATG Data·US reference·HYDAT daily mean level and discharge for Canadian Columbia basin gauges and reservoirs, back to 1903.	daily	01970
ECCC Real-Time Hydrometric (Columbia)ATG Data·US reference·Real-time water level and discharge at Canadian Columbia basin gauges, including the Columbia River Treaty reservoirs.	5-minute	143.2K2026
NRCS Streamflow Volume Forecasts (Pacific Northwest)ATG Data·US reference·Official NRCS seasonal streamflow volume forecasts at HUC 17 forecast points, including the Columbia at Grand Coulee and The Dalles, every exceedance level and issuance, publications back to 1938.	semi-monthly (Jan-Jun)	01970
NWRFC Observed River ConditionsATG Data·US reference·Observed inflow, outflow, forebay and stage NWRFC prints beside its forecasts.	hourly	32.8K2026
NWRFC Short-Range River ForecastsATG Data·US reference·Official NWRFC short-range (about ten-day, six-hourly) forecasts of inflow, outflow, forebay and stage at Columbia Basin hydro projects, every issuance kept.	hourly	2.2K2026
NWRFC Water Supply ForecastsATG Data·US reference·NWRFC seasonal runoff volume forecasts at about 120 Northwest points, every exceedance level and issuance, back to water year 2005.	daily	29.3K2005
SNOTEL Daily Snowpack (Pacific Northwest)ATG Data·US reference·Daily snow water equivalent, snow depth, precipitation and temperature at HUC 17 SNOTEL and SNOLITE stations, with the 30-year median and average for % of normal.	daily	01970
USGS Stream Gauges (15-minute)ATG Data·US reference·15-minute discharge (ft3/s) and gage height (ft) at USGS gauges, with coordinates on every row.	15-minute	81.2M2026

About hydrology data

Water sets what hydro-dominated grids can generate. The catalog carries stream gauge readings, snowpack, and official river and seasonal water-supply forecasts with every issuance kept, so an outlook can be compared with what the river actually did and with what the dams produced.