The Chairman of the House Transportation and Infrastructure Committee, Representative James Oberstar (MN), along with Representatives John Dingell and Vern Ehlers (MI), introduced legislation on April 21 that attempts to restore protection under the Clean Water Act (CWA) for geographically isolated wetlands and intermittent ephemeral streams. Regulation under the CWA was changed in 2001 and 2006 by Supreme Court decisions that limited federal enforcement to navigable waterways. The new bill (H.R.