Historic Archaeology Component Form
Resource Number : 5BL.7094
Temporary Resource Number : N/A
and due south of the F4 wall. Two metal loops have been mounted to the east boulder by inserting their ends into drilled holes and then filling the holes with cement. The loops are made with 0.75-inch-diamater hammered iron that has been twisted into loops measuring approximately 3 × 4 inches. The west boulder bears a modern plaque designating the Boyd Smelter Site as a historic landmark. Feature 6 : Feature 6 comprises a small area of exposed concrete located between F3 and F7. F6 measures approximately 16 inches east-west × 11 inches north-south. The concrete extends into the surrounding ground surface, so the full extent of the concrete is undetermined. This feature is located at the east end of the east retaining pond as recorded by Smith (1997, 1998). It may be a portion of the original dam and/or headgate. Feature 7 : Feature 7 comprises a small depression located near the center of 5BL.7094. This irregularly shaped feature has maximum dimensions of approximately 50 feet east-west × 60 feet north-south × 2 feet deep. F7 is located near the center of the former east retaining pond (Smith 1997, 1998). While Smith (1997, 1998) described berms tracing the north and south sides of both former retaining ponds, no berms are currently visible in the vicinity of the east retaining pond. The berms were likely destroyed by grading during construction of the adjacent walking and biking trails, which overlap the locations of the former berms. Feature 8 : Feature 8 comprises an earthen berm located in the west half of 5BL.7094, between Boulder Creek to the south, F9 to the west, a dirt walking trail to the north, and Sunshine Creek to the east. This irregular berm measures approximately 234 feet long overall. It is broken into three sections measuring (from east to west) 49, 88, and 40 feet long. Each berm segment varies in height and width, averaging 6 feet wide at the base × 3 feet tall. This berm once formed the south retaining wall of the west retaining pond (Smith 1997, 1998). However, F8 was likely modified in recent years during construction of the adjacent walking trails and the catastrophic flood of September 2013. In addition, PaleoWest did not identify the parallel berm formerly located on the north side of the west retaining pond (Smith 1997, 1998); any such feature was likely destroyed during the construction of the Boulder Creek Path. Feature 9 : Feature 9 comprises a headgate and concrete headwall. Located at the far west end of 5BL.7094, F9 once diverted water from Boulder Creek into the west retaining pond. The feature is oriented south-southeast to north-northwest and measures 30 feet long overall. The concrete headwall is constructed of poured concrete reinforced with 1-inch-square metal rebar, with some large cobbles visible in the concrete at the base of the wall. It measures 13 inches thick and is divided into two sections by the central headgate. The southern section of headwall measures approximately 11 feet 9 inches long × 4 feet 6 inches tall. The base of the southern tip of the wall has been cut out to overlap a large boulder. The visible potion of the north section of wall, which is largely buried in the creek bank, measures 6 feet long. Between the two sections of concrete headwall is the headgate opening. Iron brackets fastened to the headwalls on either side of this opening would have stabilized a wooden headgate or slide gate that could be lowered or raised as needed to adjust the flow of water through the gate. The brackets are spaced 3.25 inches apart. Two degraded fragments of 7 × 1.5-inch lumber are fixed to the concrete headwalls on either side of the gate with large bolts. Three of the bolts have large washers embossed with “MALLEABLE PAT. MAY 10 & DEV 13.04 1 IN-30.” 1997 Colorado Cultural Resource Survey Management Data Form and Historical Archaeology Component Form for 5BL.7094. Historic Boulder, Inc. On file at the Office of Archaeology and Historic Preservation, Denver, Colorado. 1998 Colorado Cultural Resource Survey Site or Property Reevaluation Form for 5BL.7094. Historic Boulder, Inc. On file at the Office of Archaeology and Historic Preservation, Denver, Colorado. 9. Historic Component Date(s) : 1874–1918 Justification and Sources Consulted: Construction of the smelter commenced in early 1874 (Gladden 1982). It operated intermittently until circa 1918. Gladden, Sanford Charles References : Smith, Jack E.
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