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Willow shoot plantings were made in May, 1968 to reestablish woody streamside vegetation which had been removed in the relocation of a portion of the Prickly Pear Creek channel during the construction of Interstate Highway 15. Sixty-one percent of the willows planted in double rows survived the first sunmer and twenty-six percent of those planted in single rows survived. In 1969, evaluation of the plantings indicated further losses resulting in poor success overall because of unstable soil and heavy losses due to bank erosion. In April, 1971, rock and soil berms were constructed at the toe of four steep eroding banks to stop streambank sloughing along the relocated channel of Prickly Pear Creek. The berms were used in shrub experiments to test the survival of naturally occurring species, when transplanted to reestablish streambank vegetation. The survival of naturally occurring shrubs was tested from spring planting and summer plantings. In addition, survival was compared from different treatment of the plants. The best results were obtained from spring-planted horizontal (see text) willows {Salix sp. ) with 70.2 percent of the 84 planted surviving the first summer. Spring plantings of vertical willow and dogwood {Cormus stolonifeva) had survival rates of 38.0 and 12.5 percent respectively. During the first summer, survival of summer transplants was not satisfactory. Common snowberry {Symphovioavyos alhus) proved to be the most successful among the rooted stock transplanted to the back slopes adjacent to each berm. Spring was the most favorable time of year for these transplants. Blanket riprap was used to protect the highway grade from stream erosion. Willow {Salix sp.) shoots were planted in the spaces between the large rocks at the water level to speed up the revegetation process. In the spring of 1971, 100 shoots were planted on two riprap sections. In the spring of 1973, an additional 182 shoots were planted in the same area. In December 1973, 167 shoots remained alive in the two areas. A third area had been left to natural seeding and only three live willows were present. Natural seeding in areas where good soil quality existed accounted for reestablishing dense vegetation on the berms and back slopes of the experimental areas. Fish population estimates in 1972 indicated that trout numbers returned to preconstruction (1967) levels with 79 rainbow trout {Salmo gaivdnevi) and 90 brown trout [Salmo trutta) per acre. The total pounds of trout (30 pounds per acre) was still below preconstruction levels (36 pounds per acre). Sucker {Catostorms aatostomus and Catostomus cormersoni) populations remained at a level 59 percent below the preconstruction numbers.

Final report, evaluation of stream improvements of Prickly Pear Creek, 1971-1973 /