Metro acquired a 20-acre natural area this month along Alder Creek, one of the most important headwaters of Rock Creek. Combined with an adjacent 20-acre parcel that Metro purchased last year, this property begins to build a swath of protected land in the Rock Creek area in western Multnomah County. Both properties are situated immediately beyond the region's urban growth boundary. The property, which was acquired for about $245,000, will play a key role in safeguarding water quality. It includes 1,700 feet along Alder Creek, which supports winter steelhead and flows into Rock and Abbey creeks one mile south.