Comparing Two Alternatives

During 2005, an alternatives analysis examined the various supply options and two were selected for study in an Draft Planning Report/Environmental Impact Statement (Draft PR/EIS). The two alternative are:

• A 40-foot dam raise at Hagg Lake with a raw water pipeline pumpback.
• A multiple source option that includes a 25-foot dam raise at Hagg Lake with a raw water pipeline pumpback and expansion of the Willamette River Water Treatment Plant for municipal uses.

These action alternatives will be compared against a no-action alternative in the Draft PR/EIS. When the Final EIS is completed, RECLAMATION, in cooperation with the local partners, will select a final project through a Record of Decision (ROD).

Schedule

The schedule for completion of the Draft PR/EIS is dependent on the outcome of Reclamation's Corrective Action Study, expected by Fall 2011.

Click on the map above to enlarge the map and visually compare the two options (PDF, 2.4 MB).

Tualatin Basin Water Supply Brochure (PDF, 3.97 MB)

Map of 40-foot dam raise at Hagg Lake (PDF, 31MB)

Map of 25-foot dam raise at Hagg Lake (PDF, 31MB)