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E. Branch of Penobscot Below Grand Lake Matagamon

National Weather Service gauge GLMM1 · Maine · Penobscot County · 46.1343, -68.7939 · USGS 01029100

Flood levels

Official flood levels at this gauge: action stage begins at 7.5 ft; minor flooding begins at 8.5 ft.

Action stage7.5 ft
Minor flooding8.5 ft

Highest recorded crests

What the water does

National Weather Service impact statements for this gauge, in the Weather Service's own words.

7.5 ftIncreasingly dangerous flows being discharged from the Grand Lake Matagamon Dam upstream. Water will begin flooding low lying campsites on the right bank downstream of the Grand Lake Road bridge. Water will be approaching the campsites on the left bank upstream of the Grand Lake Road bridge.
8.5 ftMinor flooding is occuring with extremely dangerous flows greater than 5800cfs from the Grand Lake Matagamon Dam. Campsites on the left bank upstream of the Grand Lake Road bridge will become inaccessible. Campsites begin flooding downstream of the bridge on the right bank. Campsites will be flooding downstream in the Katahdin Woods and Waters Momument land including areas from The Oxbow to Grand Pitch.
9.5 ftSimilar flooding to December 19th, 2023 with extremely dangerous flows greater than 6800cfs downstream from Grand Lake Matagamon Dam to Spencer Rips. All campsites inundated with 1 to 2 feet of moving water upstream of the Grand Lake Road bridge on the left bank side of the river. Several campsites downstream of Grand Lake Road bridge flooded to the Katahdin Woods and Waters Monument on the right bank side of the river.

Forecast office: NWS Caribou · River Forecast Center: Northeast River Forecast Center.

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