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Preliminary Results of the Stream Habitat Assessments

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REACH A: Upstream reference reach downstream of White's Bridge

Reach A is a stable reference site that had excellent habitat scores on all three visits (110,113,and 114). Bottom substrate and available cover consist of greater than 50% cobble, gravel, submerged logs, and overhanging brush. The banks are lined with post and logs from logging operations of the past. In-stream gravel, logs, cobble, and boulders are somewhat covered with silt and sand, but generally less than 30%. All types of habitat (pools, runs, and riffles) are well represented with none greater than 50%. Streamflow is year around with substantial groundwater inputs. The stream bottom is mostly hard with some areas of soft sand and silt, especially in the pools. The reach consists of mostly riffles, runs and shallow pools, but a large, deep pool exists in the downstream section. The stream banks are moderately stable with some erosion potential in extreme floods. The stream banks are well vegetated with shrubs and trees. Logs and boulders are present along the banks.

REACH B: Dam remnant impoundment area

Reach B underwent dramatic habitat changes after the dam foundation was removed. The habitat score in the impoundment went from fair (69) before removal to good (106) after the dam remnant was removed and rated excellent (112) one year later. Stream substrate in the reach went from predominantly sand to a diverse mixture of gravel, cobble, boulders, and logs. Cobbles, boulders, gravel, and logs that had been buried by sand were exposed to greater than 50%. The reach went from an impoundment to a series of riffles, runs, and pools of various depths and velocities. The reach went from a soft sand/silt bottom to a hard bottom with only soft bottoms present in the deeper pools. The stream Banks became fairly exposed after dam remnant removal, but quickly grassed over and stability should improve as shrubs and trees begin to fill in.

REACH C: Reach downstream of dam remnant, located in Hemlock Park

Reach C underwent slight habitat degradation after the dam remnant was removed, but habitat scores remain good. Habitat scored good (88) before removal; good (84) after the dam remnant was removed; and rated good (79) one year later. The most noticeable habitat change after the dam remnant removal was an increase in siltation and embeddedness. Gravel, cobbles, boulders, and logs that use to be only 25% covered with sand and silt became up to 70% embedded. Some of the deeper pools were filled in with sand. The reach still has a good mix of riffles, runs, and pools. Stream banks are sloped and moderately unstable. Bank vegetation is predominantly grasses.

REACH D: Reach downstream of Hemlock Park, located at USGS gaging station

Reach D underwent slight habitat degradation after the dam remnant was removed, but habitat scores remain good to excellent. Habitat scored excellent (108) before removal; excellent (107) after the dam remnant was removed; and rated good (102) one year later. The most noticeable habitat change after the dam remnant removal was a slight increase in siltation and embeddedness. Reach D is a high gradient stretch of river with increased velocities. Gravel, cobbles, boulders, and logs that use to be 25% covered with sand and silt may now be up to 50% embedded, however, in most places velocities of 3-4 feet per second are capable of transporting suspended sediments down stream. The reach has an excellent mix of riffles, runs, and shallow pools. The banks are moderately stable and well vegetated with trees.

REACH E: Reach downstream of USGS gaging station, located in High Banks Park

Reach E is in backwater from Rogers Pond dam. Stream habitat was substantially altered in 1966 by the transport and deposition of an unknown volume of sediment when the upper 13 feet of the dam was removed. Removal of the lower dam remnant continued to move sediment into this reach. The habitat score in the reach rated fair (68) before removal; fair (68) after the dam foundation was removed; and rated fair (54) one year later. The most noticeable habitat change after the dam remnant removal was a substantial increase in siltation and embeddedness. Cobbles, boulders, and logs that use to be only 70% covered with sand and silt became up to 90-100% embedded. Some of the deeper pools were completely filled in with sand. The reach that use to have some riffles and pools, basically became one long run. The stream banks are sloped and moderately unstable. Bank vegetation is predominantly grasses.

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