New Hampshire · Errol, NH

Androscoggin River float season

Gauge 01053500 on the Errol Dam through Seven Islands toward the Thirteen Mile Woods. Steady dam-fed flows and moose-lined banks in the Great North Woods make the Errol stretch a beloved mix of canoe touring, raft runs, and riverside camping.

canoeraftkayak Fullest: Mar–May Leanest: Sep–Nov
Androscoggin River — typical flow through the year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 500 2k 4k 6k
median flow for the date middle half of years (25th–75th percentile) most years (10th–90th)

Right now at this gauge

loading CFS

Checking the live gauge…

Live reading from the USGS gauge page for Androscoggin River. Provisional data — subject to revision.

The year on this river

In a typical year at the Errol gauge, the Androscoggin River runs fullest Mar–May and leanest Sep–Nov. Where today's reading falls inside that rhythm matters more than the raw number — the same flow that feels thin in spring can be the summer norm. Half of all past May days at this gauge ran above 2,300 CFS; the November median is 1,470 CFS.

Median of daily flows in each month across this gauge's full record — half of past days ran above these figures, half below.
Month Typical flow (CFS)
January 1,810
February 1,910
March 1,860
April 1,700
May 2,300
June 1,840
July 1,700
August 1,690
September 1,645
October 1,530
November 1,470
December 1,670

Record context

This gauge has measured daily flow since 1905 — 121 years of record. The largest daily average ever logged here was 16,100 CFS, in May 1969. Rivers do that sometimes; it's why the safety panel above isn't decoration.

Planning dates? The trip-window checker shows what flows have historically looked like on any week you pick for this river, or see what a CFS actually looks like.

More New Hampshire float rivers

Common questions

When is the Androscoggin River usually at its fullest?

At the Errol gauge, the fullest stretch of a typical year is Mar–May, with the single highest monthly median in May (about 2,300 CFS). The leanest months are usually Sep–Nov.

What is a typical summer flow on the Androscoggin River?

The July median at this gauge is about 1,700 CFS — half of past Julys ran higher, half lower. Check the ribbon chart above to see how summer compares with the rest of the year here.

Is the Androscoggin River safe to float right now?

No flow number can answer that, and this site never labels a river safe. What the data can tell you is how today's reading compares with 121 years of this date's history — well above typical means pushier, colder, faster water. Pair that context with a PFD, a look at the river from the bank, and a call to a local outfitter before you commit.

Which USGS gauge does this page use?

USGS gauge 01053500 (Androscoggin River at Errol, NH), chosen because it best represents the Errol Dam through Seven Islands toward the Thirteen Mile Woods. Daily records here reach back to 1905.

Data: USGS gauge 01053500, approved daily records 1905–2026, retrieved 2026-08-07. Live readings are provisional and subject to revision. U.S. Geological Survey data is public domain.