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(1) Riverside. - ~. Alternative #1. - Alternative #1 is a structural solution on the north side for the Riverside community. (See Plate 4.) The plan includes construction of a levee and floodwall combination to protect residential structures and their contents from a 100-year flood. In addition, miscellaneous damages to streets, utilities, and yards would also be prevented. . The existing length of levee constructed by the City of Grand Junction from the Highway 340 bridge to a point about 400 feet upstream would be modified to meet Corps of Engineers standards. From this point, at the southwest corner of Riverside Park, a floodwall section along the south edge of Riverside Park would be constructed for a length of about 600 feet. This floodwall would be gated to allow access to the riverbank from the park. Thereafter, a levee section with a 12-foot-wide crown would be constructed to Hale Avenue. This portion of the levee would be set back as far from the river as practicable. From the intersection of Hale Avenue and Riverside Park Drive, the levee would head in a northerly direction adjacent to and to the east side of Hale Avenue a distance of about 800 feet to tie into natural high ground. This structural alternative would provide protection to the Riverside community by means of a floodwall, levee, and the existing high ground and embankments along Highway 340 and the railroad tracks. Appendix A presents the environmental evaluation for Alternative #l. The detailed cost estimate is included in Appendix B and the Basis of Design in Appendix c. . Alternative #2. - Alternative #2 consists of a levee-floodwall combination at Riverside community from the southwest corner of Riverside Park to the Denver and Rio Grande Western Railroad bridge. This alternative plan would be similar to Alternative #l, except instead of tying the levee to high ground at Hale Avenue, the levee would continue at a setback to the river upstream a distance of about 4,500 feet to the railroad bridge. This alternative plan was developed at the request of the sponsor to determine the cost of a levee which would also protect undeveloped property which had been purchased by the city of Grand Junction. The undeveloped land has potential uses and is being considered for a museum and other civic structures. ultimately, if the city were to pursue the construction of this levee, a continuous bicycle path could also be established on top of such a levee, completing a bike path along the riverfront through the city limits. The detailed cost estimate is included in Appendix B. Alternative #3. - Alternative #3 consists of elevating all structures in Riverside above the lOO-year flood elevation. Structures would be raised anywhere from 1 foot to about 5 feet above the existing first floor elevations. Contact 12 .