Conversation so far:
What was the Colorado River Storage Act of 1956?
The bill, sponsored by Wayne Aspinall and several western allies, called for damming several areas in the Upper Basin of the Colorado River.
Was the bill easy to pass?
because of increased environmental awareness around the country, the majority of the public opposed the project.
Was Aspinall eventually able to get the bill to pass through Congress?
The bill passed the House 256-136 in March 1956 and then-President Dwight Eisenhower signed it into law soon thereafter.
What was Aspinall political position during this time period?
Aspinall gained five other reclamation projects and three hydroelectric dams for the Fourth District.
Why did the people oppose the Act?
This became a volatile issue between environmentalists and water project advocates.
Is there anything else significant about Aspinall's role in the Colorado River Storage Act?
In 1954 alone, the Department of the Interior received 20,000 pieces of mail about the plan.

Question: What were the nature of the mail received?
Self-contained rewrite: What was the nature of the mail received by Aspinall regarding the Colorado River Storage Act?