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. 0181 Economic and Financial Analyses in the reservoir area to current standards as contrasted with replace- ment in kind. About 23 miles of this highYaY, exclusive of sections acrOss the crest of the dam and the Riverside dike, require reconstruc- tion. Most of the highway presently has a 28-foot width or more and the entire relocation would be constructed with a 30-foot width. The cost estimate for replacement in kind is $3,540,000 and for reconstruc- tion to current standards is $3,679,000. Under provisions of Public La'" 87-874 the incremental cost of $139,000 is set out as a nonreimbur- sable allocation. The associated intel~st during construction amounts to $11,300; hence, both of these costs are netted from the project investment in benefit-cost analysis as it is presumed that the unevaluated benefits of the highway improvement would equal the costs. COST ALLOCATION . Costs of the Narrows Unit, consisting of project costs, interest during construction, and ap~ual OM&R, are allocated concurrently among the functions of irrigation, flood control, recreation, and national and local fish and wildlife enhancement by use of the separ- able costs-remaining benefits method. To establish ceilings for allocated costs for each of the multiple purposes a comparison is made between benefits, which previously have been presented, and the costs of the most economic single-purpose alternatives. The lesser of these two amounts for each purpose is identified as the justifiable invest- ment and it establishes the upper limit for the allocation. Single Purpose AI terTIa ti ves Considering the limits placed upon the allocations to recreation and fish and wildlife enhancement by the benefits accruing from those purposes, it is not possible to conceive of single purpose alternatives for either purpose at costs which would be justifiable. An alternative for either necessarily would involve Yater impoundment on the South Platte River at costs obviously in excess of the benefits. . Cost estimates for irrigation and flood control alternatives, however, are described subsequently. These alternates would provide, as nearly as pOSSible, service and benefits equivalent to those arising from the multiple-purpose Narrows Reservoir. The same site used for the multiple-purpose dam and reservoir is the most economical for postulation of each of the alternatives. TIle capacity of 75,000 acre-feet used for joint-use storage in the multiple-use plan was included in both alternatives in addition to the exclusive irrigation 90