Key: R = revised
Notes: These data cover wetlands acreage affected by Federal-Aid Highway projects, approximately 24% of the total mileage of the U.S. public roads. These data are collected by states using varying collection methodologies. The mitigation ratio equals acres mitigated to acres impacted.
Source: 2000-2004 - U.S. Department of Transportation, Federal Highway Administration, Federal Highway Administration Wetland Mitigation Performance Measure for Federal-Aid Highway Projects Fiscal Year (FY) 2004, available at http://fhwa.dot.gov/environment/perform/wetrpt04.htm. 2005-2006 - USDOT, FHWA, personal communication, August 2007.