Results 1 to 7 of 7
  1. #1
    mtbr member
    Reputation:
    Join Date
    Apr 2013
    Posts
    11

    New question here. Colorado best dirt composition

    Hey All,

    Working with a group of people to build a community pump track in Alamosa county. Was wondering what are the best dirt compositions for Colorado? Have done some research that says high clay content in screened loam, but what composition would that be? 60/40 clay/loam? more or less? Also have seen recommendations for pitchers mound dirt, which is 40% clay, 40% sand, and 20% silt. Currently have screened loam, and just need to specify how much clay should be added.

    Thanks!
    Kristen

  2. #2
    Living the High Life
    Reputation: Ithnu's Avatar
    Join Date
    Feb 2007
    Posts
    4,381
    Wow. This is the best question asked in this forum in years.

    Me, I don't know. But I hope IndecentExposure pipes in as he was one of the guys who helped build Golden Bike park.
    You have just been mentally Rick Roll'd. Yup you're thinking about it right now aren't you? Don't fight it.

  3. #3
    Almost Human
    Reputation:
    Join Date
    Sep 2007
    Posts
    2,029
    60% clay is a clay soil.
    40-40-20 is a clay loam, but since loam is from 5-25% clay it's hard to say how much clay to add without doing a soil texture analysis on it first to find out.

    I probably would not go more than 1:10.


    Colorado best dirt composition-213-2.jpg



    Quote Originally Posted by kristenHS2 View Post
    Hey All,

    Working with a group of people to build a community pump track in Alamosa county. Was wondering what are the best dirt compositions for Colorado? Have done some research that says high clay content in screened loam, but what composition would that be? 60/40 clay/loam? more or less? Also have seen recommendations for pitchers mound dirt, which is 40% clay, 40% sand, and 20% silt. Currently have screened loam, and just need to specify how much clay should be added.

    Thanks!
    Kristen

  4. #4
    mtbr member
    Reputation:
    Join Date
    Apr 2013
    Posts
    11
    Quote Originally Posted by UncleTrail View Post
    60% clay is a clay soil.
    40-40-20 is a clay loam, but since loam is from 5-25% clay it's hard to say how much clay to add without doing a soil texture analysis on it first to find out.

    I probably would not go more than 1:10.


    Click image for larger version. 

Name:	213-2.jpg 
Views:	100 
Size:	184.1 KB 
ID:	788465

    Awesome thank you!

  5. #5
    mtbr member
    Reputation: rogbie's Avatar
    Join Date
    Jun 2011
    Posts
    842
    Keep in mind, clays tend to swell and shrink causing cracking at the surface.

    For more reference:

    DJ, pump track plans

    and

    Pump Track Nation

    It's either food or pump track in my yard. Eating won, this year.

  6. #6
    i like rocks
    Reputation: euroford's Avatar
    Join Date
    Sep 2006
    Posts
    1,388
    my biggest design criteria for pumptrack/dj dirt has always been:

    no rocks.

    FREE.
    Tim M Hovey

    IMBA CAMBr COMBA BMA
    Transition Bottlerocket
    Gary Fisher Rig
    Blk Mrkt MOB 4x
    1950 CJ3a
    1999 F350 PSD

  7. #7
    eci
    Reputation: snowskilz's Avatar
    Join Date
    Feb 2004
    Posts
    2,636
    Concrete

Similar Threads

  1. Future pump track specs/dirt composition
    By kristenHS2 in forum Trail Building and Advocacy
    Replies: 20
    Last Post: 02-02-2014, 03:20 PM
  2. Colorado Dirt cyclocross endurance race August 17
    By Snomyzr in forum Colorado - Front Range
    Replies: 9
    Last Post: 04-08-2013, 08:06 PM
  3. Colorado Dirt cyclocross endurance race
    By Snomyzr in forum Cyclocross
    Replies: 1
    Last Post: 04-08-2013, 08:04 PM
  4. Colorado Dirt compositions
    By kristenHS2 in forum Colorado - Western Slope
    Replies: 0
    Last Post: 04-07-2013, 07:32 PM
  5. Colorado Dirt conditions?
    By jay80424 in forum General Discussion
    Replies: 0
    Last Post: 03-09-2011, 08:04 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •