|Acres impacted||Acres mitigated||Acres gained (net)||Mitigation ratio|
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.
SOURCES: 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. 2005-2006-USDOT, FHWA, personal communication, August 2007.