USDA Forest Service Boise Aquatic Sciences Lab - Rocky Mountain Research Station



Boise Aquatic Sciences Lab
322 East Front Street
Suite 401
Boise, ID  83702

(208) 373-4340
(208) 373-4391 (FAX)

United States Department of Agriculture Forest Service.

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Streamflow Data

The Boise Database consists of files from the Silver Creek Study Area and the Horse Creek Study area.


There are other data available from various agencies and different locations at the Climatological and Hydrological Data Access page.



Horse Creek Study

General Study Information

The Horse Creek administrative-research study, is a paired watershed study, designed and initiated in 1965 to determine feasible methods to provide access to and harvest the timber resource in the mountainous terrain of north central Idaho. The East Fork of Horse Creek serves as an undisturbed control watershed. All management activities have been confined to the Main Fork of Horse Creek watershed. The calibration period extends from 1965 up to the summer of 1978 when road construction activities began in the Main Fork Horse Creek watershed. The evaluation of erosion and hydrologic consequences of various forest management activities were conducted by the Rocky Mountain Research Station and the Northern Region of the U.S. Forest Service.

open book graphic   Publications

globe graphic  Horse Creek Maps

Horse Creek Study Area
Horse Creek Study Area with treatments through 1984

camera graphic  Photographs

Main and East Fork of Horse Creek
East Fork of Horse Creek
Main Fork of Horse Creek
Lower Horse climatic station

Pretreatment vegetation

The watersheds are timber covered with the exception of scattered occurrences of wet bottom land along the major streams and several small meadows and alder glades along the western drainage boundary. The most extensive habitat type in the area is Abies grandis/Clintonia uniflora. Other commonly occurring habitat types include Abies lasiocarpa/Xerphyllum tenax, Thuja plicata/Clintonia uniflora, Abies lasiocarpa/Clintonia uniflora, Abies grandis/Xerphyllum tenax, and Abies lasiocarpa/Menziesia ferruginea. Tree species found in substantial numbers include grand fir (Abies grandis [Dougl.} Forbes), western red cedar (Thuja plicata Donn), western larch (Larix occidentalis Nutt.), Engelmann spruce (Picea engelmannii Parry) and lodgepole pine (Pinus contorta var. latifolia Engelm.). Douglas-fir (Pseudotsuga menziesii var. glauca [Beissn.] Franco) and ponderosa pine (Pinus ponderosa Dougl.) also occur on some of the south facing slopes.


Soil Description

The soils are Inceptisols formed from the weathering of predominantly metasedimentary parent material and modified by deposition of loessial material of volcanic origin. The majority of the area has a mosaic of four soils, distributed partially on the basis of slope gradient and topographic position. The two most extensive soils are Andic Dystrochrepts, one coarse loamy and the other loamy skeletal. Second in extent are Typic Vitrandepths, one medial over loam and the other medial over loamy skeletal. Both skeletal soils are usually associated with ridgetop positions and the Vitrandepts with less steep landscapes. In the headwaters at elevations above about 1,525 m are occurrences of coarse loamy,mixed, frigid Typic Haplumbrepts, usually formed under seral alder or bracken fern; coarse loamy, mixed, frigid Typic Vitrandepts formed under grand fir habitat types; and coarse loamy, mixed, Entic Cryandepts formed under subalpine fir habitat types. Aquepts occur locally in low lying portions of the landscape, adjacent to streams and in headwater areas.


Geology Description

The watersheds are located in the borderzone of the Idaho Batholith, a complex series of related igneous intrusions that contact Precambrian metasedimentary rock of the Belt Super Group. The sedimentary rock was altered by other metamorphic episodes prior to the batholith intrusions. The metasedimentary materials vary and intergrade from quartz-biotite-plagioclase gneiss and schist to biotite-plagioclase quartzite (Greenwood and Morrison, 1973).


Treatment History

All management activities have been confined to the Main Fork Horse Creek watershed. These management activities include: 6.975 km ( 11.1 ha) of midslope road construction on the north side of the Main Fork of Horse Creek in the summer of 1978; 4.837 km (7.5 ha) of midslope road construction on the north side of the Main Fork of Horse Creek in the summer of 1979; timber harvest in 8 harvest units ranging in size from 3.6 to 14.2 ha (total area 73.8 ha) on the north side of the Main Fork of Horse Creek in the summer of 1981; broadcast burning in the harvest units in the fall of 1981 and 1 unit in the spring of 1982; 9.009 km (13.5 ha) of near ridge-top road construction on the south side of the Main Fork of Horse Creek in 1983 and 1984.


water droplet graphicStreamflow Data


MAIN_200   |  EAST_300  |   MAIN_200 & EAST_300 Combined

water droplet graphicClimatic Data







USDA Forest Service - RMRS - Boise Aquatic Sciences Lab
Last Modified:  Thursday, 08 April 2021 at 18:37:53 CDT

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