Manure Spreading Advisory (MSA)

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The following Manure Spreading Advisory (MSA) should be used in conjunction with your Nutrient Management Plan and application guidance to help you determine when applying manure is advisable.

Want to Apply Manure? Answer These Four Questions:


Learn more using these Manure Spreading Resources.

Click your location on the map to access the ARM Field Risk Assessment Worksheet to determine if application is okay on your field right now. If the risk is high, don't apply!


Current Conditions: April 2021 - Fields are drying but rain showers are still in the forecast (April showers bring May flowers!). Do NOT apply before any significant (>0.5 in rain in 24 hours) rain event, as the risk of runoff can still be high. Do NOT apply to saturated, frozen, or snow covered fields. Application setback distance is 40 feet from all waterways and swales. 
Check the MSA often for big rain events and dry windows.   Fill out an ARM Worksheet prior to application (link on MSA map) and/or if rain is in the forecast or if you might have wet, saturated field conditions.

(This map is updated daily by 6:00 am. If the advisory date is not current on your map, press the "F5" button on your keyboard to refresh the page.)

The risk value on the map is based on the 72 hour precipitation forecast for a given area. This value best predicts the potential risk associated with movement of manure applied to a field.

Notes on Manure Spreading Advisory (MSA) Map

This advisory is the first step in assessing if your field conditions are suitable for manure application and should be followed up with observation of your field characteristics to determine if manure application is appropriate at any time of the year. In some cases, even when the advisory is med-high, you may have individual fields that can be applied to because they are low risk. The ARM worksheet will help you take the next step to assess the risk associated with application to individual fields.


Please note, even if this map says your risk is low, it cannot account for every variable or condition present on your field. It is your responsibility to use your best judgment and adhere to all application guidelines outlined in your plan. Always err on the side of caution to prevent unwanted discharges. Manure application practices that cause a discharge can lead to fines and/or necessitate a CAFO permit for your facility. The Whatcom Conservation District and the NRCS assume no responsibility for inappropriate manure application. Proper application is ultimately your responsibility.

This page was last modified on 04/07/21 - 07:46