Thank you so much!
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Dear darlenemcginnis,

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YOUR QUESTION #0141370:

Bean plant

Why are some of the leaves on our bean plants are getting brown spots.

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Are you able to provide any photos of the spots? This will help with narrowing down the issues.

Thank you, Darlene, for your question! 
  I believe this article
Growing beans in home gardens | UMN Extension
may be the most helpful in diagnosing what is going on with your bean plants and why there might be brown spots on the leaves. (Even though some of the language uses "soybeans" green beans are in the same family of plants as soybeans and the information can be applied to green beans.)

•   Click on the link which will take you to the article. 
•   Scroll down to the section "Managing pests, diseases, and disorders"
• Under this heading click on +diseases and this will detail some of the scenarios that may be occurring with your plants
• Click on the wordsbacterial blight which takes you to another page that points out - spots are on the younger leaves (those being the ones furthest from the base of the plant) it may be bacterial blight                                                                  - spots on the older leaves may be from Septoria brown spot 
• In either case the weather conditions have favored either of these two diseases in your garden. 

 
    Bacterial blight (caused by a bacteria) is spread by wind and rain and by cultivation when foliage is wet. The bacteria can overwinter in the soil so garden hygiene is a must - remove any infected leaves and throw them in the trash. 
Try to increase air circulation around your remaining plants. Next year practice crop rotation - placing another plant from a different family where your beans are now and of course removing all infected plants from the surface of the soil. 
Managing plant diseases in the home garden | UMN Extension
   Septoria brown spot (caused by a fungus) rarely causes a huge loss of produce. 
Septoria brown spot | UMN Extension
Again, however, you will want to plant a different kind of plant in the bean spot next year. 

For further reading and future reference
Michigan State University has several web pages that may be of help to you now and in the future.
Smart Vegetables - Gardening in Michigan (msu.edu) 

Gardening in Michigan (msu.edu)

How to Grow Beans - Part 1 - MSU Extension