Sandbars

Cutaway of Glen Canyon Dam releasing a labeled high-flow pulse toward Grand Canyon sandbars

Glen Canyon Dam HFE operations under LTEMP (2025–2026)

How High-Flow Experiments from Glen Canyon Dam work under LTEMP — and why the fall 2025 and spring 2026 artificial floods were cancelled.

September 23, 2026 · 5 min · 1004 words · Justin
Illustrated Colorado River cutaway shows a gage, submerged sand, survey boat, and plant plots under canyon walls.

USGS river science infrastructure in Grand Canyon

Gages, sediment samplers, sandbar surveys and plant plots measure how dam operations and tributary floods change the Colorado River.

September 23, 2026 · 6 min · 1187 words · Justin