ARM Worksheet

(Application Risk Management)

Contact Us


(360) 526-2387

Current Spreading Conditions


Current Manure Setback:

= 10 ft minimum

June through August
**Big gun application should never be closer than 40ft due to drift

The following ARM Worksheet should be used in conjunction with your Nutrient Management Plan and application guidance to help you determine when applying manure is advisable.

To access the ARM Worksheet follow the steps below.

Want to Apply Manure? Follow These Steps!
​Before you start: 
  1. Learn how to use this tool

  2. Know the current Manure Application Setback Distance: June - August = 10 feet minimum (40 feet for big guns)

  3. Learn more using these Manure Spreading Resources

6 Steps for Application Risk Management
  1. Evaluate your fields

  2. Check the forecast by clicking your location on the ARM Weather Map below
    (Click HERE for MOBILE version if the map below does not load for you)

  3. Fill out the ARM Worksheet by clicking the ARM Worksheet link in the map pop-up and find out your application risk rating.
    You can link directly to the worksheet HERE or access it through the map to auto-fill precipitation data. 

  4. Print and save your worksheet for your records. If the risk is high, don't apply!
    Need to spread on a high risk day? CLICK HERE!

  5. Apply manure using the guidance in your Farm Plan

  6. Monitor your fields for any sign of runoff, discharge from fields, or ponding. 
    Emergency spill procedures can be found HERE

Direct link to ARM Worksheet

Printable ARM Worksheet
Field assessment guidance
Weather prediction data (click Forecast Precipitation on right side)

Past weather data (select the closest weather station)

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 the ARM Weather Map

This ARM Weather Map 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.


We got the idea on how to present the information from the Wisconsin Manure Management Advisory System.  Thanks to Rick Wayne, UW-Madison, Dept. of Soil Sciences for helping on this project!

Thanks to Greg Corradini for a lot of the help getting this code together.  Without him there wouldn't be a site!

Of course we wouldn't have much of a site without the data we retrieve from the NOAA prediction website.



Questions? Comments? Get in touch!

If you have any questions or if you have ideas on how we could improve this tool we would love to hear from you. Whatcom Conservation District dairy planner Dakota Stranik can be reached by call or text at 360-526-2387 or via email at dstranik@whatcomcd.org – If you would like help with your manure management decisions she is happy to help.

Current Spreading Conditions 

 August 2022 - We are now in the dry season, but rain is still possible. Setbacks are 10 feet (or 40 feet for big guns) June. Be sure to check the forecast and continue to watch out for rain events. Follow your Application Risk Management Plan for manure applications and document your decisions with the ARM Worksheet. 

  • To prevent the risk of a runoff or leaching event, and maximize application timing, follow an Application Risk Management (ARM) plan. If you do not have an ARM plan, contact WCD today to request a field evaluation. 

  • Keep an eye on the weather forecast for both rain events and flooding (https://www.nwrfc.noaa.gov/rfc/).

  • For help with irrigation, check out the Irrigation Scheduler tool from WSU: http://weather.wsu.edu/is/.


Caution needs to be taken when applying manure during high risk times. Heavy precipitation can move applied nutrients into the groundwater or off of your field and into nearby swales, ditches, and/or waterways. If this happens, you can be put under the CAFO permit.


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