. Alewife Reservation & Alewife Brook master plan. Wetlands; Wetland conservation. and when paths are proposed on a particularly steep slope or where a significant grade change needs to be accommodated. Boardwalks closer to the ground (up to feet) will have timber guards to minimize straying or falling off the edge, while boardwalks higher than feet require railings. In sensitive areas, pin-type footings will be used to mitigate impacts to the existing resource area (see Figure 35). Benches and small viewing platforms can be built into the boardwalks to provide improved opportuniti
. Alewife Reservation & Alewife Brook master plan. Wetlands; Wetland conservation. and when paths are proposed on a particularly steep slope or where a significant grade change needs to be accommodated. Boardwalks closer to the ground (up to feet) will have timber guards to minimize straying or falling off the edge, while boardwalks higher than feet require railings. In sensitive areas, pin-type footings will be used to mitigate impacts to the existing resource area (see Figure 35). Benches and small viewing platforms can be built into the boardwalks to provide improved opportunities for wildlife viewing and scenic overlooks. Recycled plastic and pressed wood products are preferred building materials to pressure treated wood for their longer life span and to avoid toxic chemicals from the wood treatment process leaching into the surround- ing soils. An alternative to timber decking is corrosion-resistant metal mesh, which would allow maximum light penetration beneath the boardwalk/overlooks. This type of decking could be used over channel inlets designed for fish migration into the newly created open wa- ter wetlands. Bridges, Overlooks and Crossings Along Alewife Brook Parkway, vehicular bridg- es cross Alewife Brook at five locations: the Route 2 rotary at the beginning of the Parkway, the intersections with Massachusetts Avenue, Broadway, Henderson Street, and the Mystic Valley Parkway. Apart from the crossing at the end of Henderson Street which serves as a neighborhood connection, all of these bridges experience heavy traffic and accommodate pedestrians only with a narrow sidewalk. It is from these bridges that one can obtain the best view into the stream environment. These views will be maintained and may be improved ( added safety measures in these locations, canti- levered platform at an existing bridge, etc.). The existing bridges should also be used to link proposed paths by installing proper crossings. FIGURE 36. Example of a small platfor
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