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GEORGE WASHINGTON MEMORIAL PARKWAY
Patowmack Canal and Locks (Great Falls Section) Historic Structures Report — Architectural Data Section |
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APPENDIX B
COST ESTIMATES/ALTERNATIVES
Costs prepared by Williamsport Preservation Training Center
February 1985
1. COST ESTIMATE/REWATER CANAL
In order to rewater the entire canal it is necessary to restore all of its operating structures to a functional condition for the following reasons:
| o | To maintain water in the cut | |
| o | To insure sufficient water and/or relieve excess water | |
| o | To regulate the flow of water | |
| o | Restore wing dam | $1,200,000 |
| o | Entrance to canal | |
| Remove silt build up | $30,000 | |
| Clear and thin vegetation | 25,000 | |
| Excavate canal prism | 25,000 | |
| $80,000 | ||
| o | Restore first spillway | |
| Demolition | $2,500 | |
| Restoration | 26,000 | |
| $28,500 | ||
| o | Upper guard gate | |
| Masonry repair and restoration | $110,000 | |
| Reconstruct gates | 75,000 | |
| $185,000 | ||
| o | Canal to lower spillway | |
| Excavation | $12,000 | |
| Clear and thin vegetation | 12,500 | |
| Repair canal walls | 65,000 | |
| $89,500 | ||
| o | Lower spillway | |
| Restore to operating level of canal | $45,000 | |
| o | Excavate canal from lower spillway to Grist Mill | $8,500 |
| o | Grist mill site | |
| Restoration of mill outlet to retain water at operating level of canal | $26,000 | |
| o | Canal from mill site to holding basin excavation | $128,000 |
| Stabilization of canal walls | 275,000 | |
| Removal of existing walkway | 8,500 | |
| $411,500 | ||
| o | Holding basin | |
| Clear cut vegetation within berm | $14,000 | |
| Selective cutting of mature trees | 8,500 | |
| Excavation | 90,000 | |
| Restoration of berm | 35,000 | |
| $147,500 | ||
| o | Reconstruct waste weir | $46,000 |
| o | Reconstruct lower basin feeder gate | $16,000 |
| o | Lower guard gate | |
| Restoration and stabilization of masonry | $75,000 | |
| Reconstruct gates | 65,000 | |
| $140,000 | ||
| o | Lock 1 | |
| Excavation | $7,000 | |
| Masonry stabilization and restoration | 150,000 | |
| Reconstruct floors, sills, gates and hardware | 450,000 | |
| $607,000 | ||
| o | Lock 2 | |
| Excavation | $7,500 | |
| Masonry stabilization and restoration | 300,000 | |
| Reconstruct floors, sills, gates and hardware | 450,000 | |
| $757,500 | ||
| o | Lower holding basin | |
| Excavation | $8,000 | |
| Clear cut vegetation | 12,000 | |
| Reconstruction of walls | 40,000 | |
| $60,000 | ||
| o | Lock 3 | |
| Excavation | $7,000 | |
| Restore west (land side) wall | 150,000 | |
| Reconstruct east wall | 250,000 | |
| Reconstruct timber framing, gates and hardware | 220,000 | |
| $627,000 | ||
| o | Lock 4 and 5 | |
| Clear debris | $5,000 | |
| Reconstruct timber framing | 400,000 | |
| Reconstruct masonry | 150,000 | |
| Reconstruct gates | 450,000 | |
| Reconstruct operating hardware | 100,000 | |
| $1,105,000 | ||
| o | Selective clearing of vegetation at locks | $12,000 |
| o | Reconstruct visitor walkway from mill site to Locks 3, 4 and 5 | $38,000 |
| TOTAL | $5,630,000 | |
2. COST ESTIMATE/DRY CANAL
| o | Canal Prism | |
| Construct earthberm at upstream entrance | $33,000 | |
| Backfill canal prism to operating level | 345,000 | |
| Install subsurface drainage | 165,000 | |
| Construct pedestrian walkway | 185,000 | |
| Clear and thin vegetation, reseeding | 29,000 | |
| Construct culvert at Mine Run | 140,000 | |
| Stabilize and restore masonry structures | 145,000 | |
| $1,042,000 | ||
| o | Holding Basin | |
| Stabilize stone retaining wall | $45,000 | |
| Selective restoration of masonry features | 46,000 | |
| Clear & thin vegetation, reseeding | 8,000 | |
| Provide earth fill to operating level | 9,000 | |
| Construct pedestrian walkway and bridge | 26,000 | |
| Paving to delineate land side of canal | 235,000 | |
| $369,000 | ||
| o | Head Gate | |
| Selective restoration and stabilization of masonry | $31,000 | |
| Earth fill to operating level | 26,000 | |
| Clear and thin vegetation, reseeding | 8,000 | |
| $65,000 | ||
| o | Lock 1 | |
| Selective restoration and stabilization of masonry | $45,000 | |
| Excavate lock to historic elevation | 7,000 | |
| Reconstruct two pairs of lock gates | 435,000 | |
| Provide subsurface drainage | 6,000 | |
| Backfill at lock ends | 15,000 | |
| Construct stair and walkway | 15,000 | |
| Clear and thin vegetation, reseeding | 35,000 | |
| $558,000 | ||
| o | Lock 2 | |
| Selective stabilization and restoration of masonry | $90,000 | |
| Install subsurface drainage | 20,000 | |
| Construct retaining wall | 15,000 | |
| Earth fill to operating level | 31,000 | |
| Clearing, thinning, and reseeding | 9,000 | |
| $165,000 | ||
| o | Locks 3, 4, and 5 | |
| Stabilize masonry | $44,500 | |
| Clearing, thinning, and reseeding | 27,000 | |
| Earth fill to operating level | 18,500 | |
| Construct pedestrian walkway in gorge with barrier at river end | 26,500 | |
| Clear debris in gorge | 5,000 | |
| $121,500 | ||
| TOTAL | $2,320,500 | |
3. COST ESTIMATE/IMPOUNDMENT
| o | Partial rewatering of the canal, using water from mine run to impound water from the upstream entrance to the grist mill site. | |
| o | Canal entrance | |
| Clearing and thinning vegetation | $8,000 | |
| Earthberm dam with riprap on river side and overflow structure for excess water from mine run | 33,000 | |
| $41,000 | ||
| o | First spillway | |
| New riprapped earthberm over existing stone remains | $9,500 | |
| o | Canal to lower spillway | |
| Clearing & thinning vegetation | $12,500 | |
| Selective repairs to stone walls | 87,000 | |
| $99,500 | ||
| o | Regrade canal bed | $145,000 |
| o | Lower spillway | $37,000 |
| o | Canal from lower spillway to grist mill | |
| Excavation and dewatering operations, cutback and riprap at existing draining entering canal | $137,000 | |
| o | Grist mill site | |
| Construction of outlet point, waste weir and spillway | $26,000 | |
| Riprapped earthberm at limit of impounded area | 8,000 | |
| $34,000 | ||
| SUBTOTAL | $503,000 | |
4. COST ESTIMATE (DRY CANAL FROM GRIST MILL SITE TO OUTLET AT DOWNSTREAM END)
| o | From lower spillway to holding basin | |
| Construct pedestrian walkway | $185,000 | |
| Clear thin vegetation, reseeding (past Grist Mill Site) | 12,500 | |
| Stabilize and restore masonry structures | 58,000 | |
| $225,000 | ||
| o | Holding basin | |
| Stabilize stone retaining wall | $45,000 | |
| Selective restoration of masonry features | 46,000 | |
| Clear and thin vegetation, reseeding | 8,000 | |
| Provide earth fill to operating level | 9,000 | |
| Construct pedestrian walkway and bridge | 26,000 | |
| Paving to delineate land side of canal | 235,000 | |
| $369,000 | ||
| o | Head gate | |
| Selective restoration and stabilization of masonry | $31,000 | |
| Earth fill to operating level | 26,000 | |
| Clear and thin vegetation, reseeding | 8,000 | |
| $65,000 | ||
| o | Lock 1 | |
| Selective restoration and stabilization of masonry | $45,000 | |
| Excavate lock to historic elevation | 7,000 | |
| Reconstruct two pairs of lock gates | 435,000 | |
| Provide subsurface drainage | 6,000 | |
| Backfill at lock ends | 15,000 | |
| Construct stair and walkway | 15,000 | |
| Clear and thin vegetation, reseeding | 35,000 | |
| $558,000 | ||
| o | Lock 2 | |
| Selective stabilization and restoration of masonry | $90,000 | |
| Install subsurface drainage | 20,000 | |
| Construct retaining wall | 15,000 | |
| Earth fill to operating level | 31,000 | |
| Clearing, thinning, and reseeding | 9,000 | |
| $165,000 | ||
| o | Locks 3, 4, and 5 | |
| Stabilize masonry | $44,500 | |
| Clearing, thinning, and reseeding | 27,000 | |
| Earth fill to operating level | 18,500 | |
| Construct pedestrian walkway to gorge with barrier at river end | 26,500 | |
| Clear debris in gorge | 5,000 | |
| $121,500 | ||
| SUBTOTAL | $1,533,500 | |
| Total Cost For Partial Impoundment From Upstream Entrance To Grist Mill Site And For Dry Canal From Grist Mill Site To Downstream End. | $2,037,000 | |
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patowmack_canal_hsr/appb.htm
Last Updated: 17-June-2011