Flow Accumulation

Every river, creek, and drainage in the US — extracted from raw USGS elevation data via D8 flow analysis. No rivers are drawn by hand — the network emerges from the elevation.

Same engine, scalable from one state to the continent. Click any stream segment in the demos for its Strahler order.

Continental US

v1 — CONUS-wide · 364,685 streams

Mississippi → Gulf · Strahler 8

Missouri

v1 — 234,000 km² · 41,975 streams

Mississippi outflow · Strahler 8

Tennessee

v1 — 138,370 streams

Tennessee + Cumberland + Mississippi · Strahler 8

Colorado

v1 — 97,434 streams

Continental Divide · Strahler 8

Pacific Northwest

v1 — 166,411 streams · OR + WA

Columbia + Snake + Willamette · Strahler 9

Florida

v1 — 147,597 segments · sheet drainage

St Johns + Suwannee + Everglades · Strahler 8

California

v1 — 223,725 streams

Sacramento + San Joaquin + Klamath · Strahler 8

Yosemite

v1 — 3,427 streams · pairs with /parks/yosemite

Tuolumne + Merced · Strahler 6

Yellowstone

v1 — 13,244 streams · three-ocean drainage

Yellowstone + Madison + Snake · Strahler 7

Grand Canyon

v1 — 8,301 streams · Colorado mainstem

Colorado · Strahler 7