Ammonoosuc Ravine Snowpack

By Helon Hoffer | Mount Washington Avalanche Center

Date of Observation: March 25, 2019  11:00 AM
Location of Observation: Ammonoosuc Ravine and Monroe Brook

New snow, including wind slabs, can be found on most aspects in the Ammo as well as Monroe Brook. New snow was largely pencil and 1F hard on the surface, with hardness increasing as elevation increased. The structure of the snowpack varies greatly above the melt/freeze crust, but no sign of propagation was observed in our travel or in several tests. In comparison to the snowpack on East side of the range, the Ammo is still a shallow snowpack, though paths are developed enough to produce small avalanches. We did observe sun crusts on southerly aspects below 3500′.


Snowpack observations are one part of the complex puzzle which is your decision to enter avalanche terrain. Some observations may include stability tests. It’s important to understand that the results of a stability tests are seldom conclusive anywhere, but particularly in snow climates and terrain like ours where the primary driver of instabilities is wind drifted snow. Many stability tests exist and each works best with specific avalanche problem types. Stability test results should never be used alone as an indication that a slope or conditions are safe particularly when more obvious red flags are present. Please use this page as part of your information gathering process, but don’t make decisions based on a single piece of information. A good article that summarizes some of the issues associated with snow and avalanche observations can be found here.

The Mount Washington Avalanche Center cannot verify the quality or accuracy of any observations that come from the general public.


See an avalanche or evidence of previous avalanche activity?  Near-miss? Snowpack observations?

Your observations are valuable to an accurate forecast! We welcome observations from everyone. You don’t need to be an avalanche professional to submit helpful observations, just be as detailed and accurate as you can.