In order to track U.S. Congressional voting on immigration issues, FAIR issues periodic Voting Reports. Here are voting reports from the 114th Congress, First Session (January, 2016): House and Senate.
NumbersUSA also produces comprehensive Congressional Immigration-Reduction Grades. Here are the Congressional immigration grades for Colorado.
Here is how to contact your US Senators and Representatives from Colorado. Here is how to contact Colorado state legislators in your district / city / county.