Scientific Investigations Report 2006-5111
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5111
Table 3. Habitat features measured for each subbasin of the historic (1867–1868) and recent (1994–2002), lower Boise River, southwestern Idaho.
[Subbasin and reach locations are shown in figure 1. Derived from MacCoy and Blew (2005). Abbreviations: ft, foot; ºC, degrees Celsius; –, no data]
| Habitat features | Subbasins | ||||
|---|---|---|---|---|---|
| Upstream of Eagle Island |
Upstream of Eagle Road |
Middleton | Mouth | ||
| Fish sampling reach numbers | |||||
| 1, 2, and 3 | 4 and 5 | 7 | 9 | ||
| Embeddedness | Historic | – | – | – | – |
| Recent | 50 percent | 75 percent | 75 percent | 50 percent | |
| Dominant substrate | Historic | – | – | – | – |
| Recent | Cobble | Cobble | Gravel | ||
| Average bankfull width | Historic | 900 ft | North channel 790 ftSouth channel 390 ft | 520 ft | 620 ft |
| Recent | 140 ft | North Channel 400 ftSouth channel 150 ft | 280 ft | 250 ft | |
| Channel forms, parafluvial surfaces | Historic | Mid-channel Islands, gravel bars | Gravel and sand bars | Some islands, sand bars | Some islands, sand bars, split channel at the mouth |
| Recent | Run, riffle, pool | Run, stabilized. | Run, exposed islands. | Deep run, few islands, no sand bars, single channel at the mouth | |
| Sloughs | Historic | Few sloughs | Some development of sloughs | Abundant | Abundant |
| Recent | None | Sloughs filled or converted to irrigation or drain ditches | Sloughs filled or converted to irrigation or drain ditches | Few natural sloughs, sloughs converted to irrigation or drain ditches | |
| Vegetation | Historic | Willow and wildrose scattering of cottonwood | Willows and cottonwood | Cottonwood, some willow | Cottonwood, some willow |
| Recent | Some stands of native cottonwood. | Alien species dominate | – | – | |
| Mean temperature | Historic | – | – | – | – |
| Recent1 | 16ºC | – | 19ºC | 21ºC | |
| Recent2 | 17ºC | – | 19ºC | 21ºC | |
1Mean temperature for July and August 1996 at U.S. Geological Survey water-quality sites at Glenwood, Middleton, and Parma (MacCoy, 2004).
2Mean daily average temperature for July and August 2004 at U.S. Geological Survey water-quality sites at Glenwood, Middleton, and Parma (City of Boise written commun., June 2005).
U.S.
Department of the Interior | U.S. Geological
Survey
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