Route 104 Corridor Trail Feasibility Study - Genesee Transportation ...

INVENTORY AND ANALYSIS
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Route 104 Corridor Trail Feasibility Study
General Characteristics of Study Area Streams. A
stable stream can be generally defined as a stream that
transports sediment load while maintaining stream
geometry and does not aggrade or degrade (Rosgen,
1996). Although many of the streams within the study
area have been engineered due to their proximity to
Route 104, these streams seem to be in stable
condition. Based on preliminary observations, in most
cases no eroded, undercut banks were observed. A
more detailed analysis is needed to accurately predict
channel stability. Streams were assessed in close
proximity to Route 104, but typically the waterways
become more scenic and naturalized further away from
the highway.
Salmon Creek, Looking North From Route 104, Williamson
As described in Table 4.3, on-site streams range in size and type from small intermittent channels (1-2ft.) to larger
perennial streams (15-20 ft.). For the most part, stream banks observed were obscured and completely vegetated in
a silt/sand substrate. The amount of silt/sand present does, however, indicate that increased sediment loading is
taking place from some upstream erosion. Smaller intermittent streams in many cases are straightened due to
adjacent development. The larger stream channels are wide and flat in a silt/sand/cobble substrate. As previously
mentioned, development is present in and around many of the streams, and the riparian corridor and floodplain are
greatly reduced, which decreases floodwater retention. In some instances, the larger streams are associated with
floodplain forest offering good shading and cover for riparian/aquatic species. With the exception of a few small
intermittent streams, sinuosity is generally more moderate in the stream reaches observed within the study area, and
water depths shallower along a gentle stream gradient. In addition, streams with a larger riparian corridor have a
more apparent natural riffle run sequence with increased stone/gravel bars creating riffles with long runs in several
locations. For more information, please see Appendix D.
Salmon Creek, Looking South Towards Route 104, Williamson
For trail planning, there are a number of things
to consider in relationship to waterways. When
planning stream crossings, there are
environmental impacts and permitting issues
that should be minimized as much as possible.
Stream crossings typically involve a structure,
such as a boardwalk or bridge, which has
associated cost impacts. Stream crossings
have positive aspects, too. Bridges often
become a landmark or destination along a trail
corridor, which can help with wayfinding in a
long, linear path such as the Route 104 Corridor
Trail. Streams also offer opportunities for
scenic views and environmental education.
Potential flooding issues can be addressed with
eco-swales, rain gardens and retention ponds.
Prepared for GTC and the Towns of Ontario, Sodus, Webster, and Williamson, NY Page 21