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California

Klamath-Northern California Coastal

Left: the Klamath-Northern California Coastal basin (WBD HUC4 1801) with its NHDPlus HR network, its larger lakes and reservoirs, Humboldt Bay and the Pacific coastal waters as water, and our Mad-Redwood model (USGS 11481200) in orange. Right: that model drawn large, every one of its channels.
Left: the Klamath-Northern California Coastal basin, with our Mad-Redwood model (USGS 11481200) in orange and its larger lakes and reservoirs, Humboldt Bay and the Pacific coastal waters in blue. Right: that model drawn large, its channels in orange.
  • 1 published SWAT+ model
  • NHDPlus HR: 125,667 km of network flow paths, 3.16x NHDPlus V2.1's 39,726 km; canals are in both counts
  • 76 USGS gauges with a 90 % daily record, 2014-2024 (21 of 22 HUC8s covered)
  • 22 HUC8s both datasets carry, 67,761.6 km² (WBD HUC12 sum)

Basin: HUC4 1801 (Klamath-Northern California Coastal) of the USGS Watershed Boundary Dataset.

Our models in this basin

Mad-Redwood · USGS 11481200 (Little River near Trinidad)

NHDPlus HR, not Version 2, in this basin

050,000100,000150,000200,000050,000100,000150,000200,000NHDPlus Version 2.1, kmNHDPlus HR, kmSacramentoSan Francisco BayKlamath-Northern California CoastalKlamath-Northern California Coastal
Each point is one basin (WBD HUC4): its network flow paths in NHDPlus Version 2.1 (across) and in NHDPlus HR (up), filled with canals and ditches in both counts, hollow without them. On the line, the two would be equal. In this figure, this basin's points are orange.

A model of your California watershed

We build a SWAT+ model for a USGS stream gauge in California, from national data. You download it as files you open in SWAT+ Editor and run, and you keep the files.

Free, $0, to try it on a real station. Starter, $50 / month USD. MAX, $100 / month USD. Cloud calibration is pay as you go, on every plan including Free.

See the plans and order

California: all our models and work