Upper Ammonoosuc River in New Hampshire
Around here
Around Upper Ammonoosuc River
Data Source: Recreation.gov · Public land: USGS PAD-US
About this river
Upper Ammonoosuc River is a 36.7 mile river. Streamflow is measured at the USGS gauge Upper Ammonoosuc River near Groveton, NH (site 01130000). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1940 to 2026
Upper Ammonoosuc River typically runs highest in April, at a median 1,150 cfs, and lowest in September, at 124 cfs. The highest flow on record for any single day is 8,350 cfs, in 1954.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 200 | 140 to 310 |
| February | 175 | 125 to 260 |
| March | 260 | 155 to 518 |
| April | 1,150 | 741 to 1,955 |
| May | 892 | 540 to 1,360 |
| June | 320 | 208 to 519 |
| July | 181 | 129 to 284 |
| August | 136 | 89 to 240 |
| September | 124 | 86 to 214 |
| October | 206 | 129 to 372 |
| November | 340 | 229 to 541 |
| December | 278 | 203 to 440 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 79 years of record. Statistics published by the US Geological Survey for Upper Ammonoosuc River near Groveton, NH (site 01130000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
2 mapped launches sit in the mapped area of Upper Ammonoosuc River, all of them public access. Ramp data comes from the USGS national boat-ramp inventory.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Upper Ammonoosuc River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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