2011-06-022011-06-021960-07-20Accession # 11566http://hdl.handle.net/1969.3/281023 pages; available for download at the link below.Objectives: To compare existing ecological conditions with those conditions which existed prior to the opening of this pass and channel.en-USecological changePort Mansfield Passwater conditionsSurvey of the Waters of Willacy County Which Are Affected by or Influenced by the Port Mansfield Pass, Jetties, or Channel - Development Survey of the Waters of Willacy County, Especially Those Which Are Affected by the Opening of the Port Mansfield Pass and Channel1 June 1959 to 31 May 1960Technical Report