Map showing depth to water table, September 1976, and area inundated by the June 1975 flood, Helena Valley, Lewis and Clark County, Montana
Open-File Report
78-110
By: Kathleen R. Wilke and M. V. Johnson
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Abstract
Depth to water table, September 1976, and area inundated by the June 1975 flood in the Helena valley, Montana, are mapped on two sheets, Helena and East Helena 7.5-minute quadrangles, at scale 1:48,000. Depth to water table was mapped using water-level measurements from existing shallow observation wells and selected domestic wells, and from field reconnaissance of topography. A hydrograph shows water-level fluctuation in two wells located in different parts of the valley. Area inundated by the June 1975 flood was mapped from aerial photos along Prickly Pear and Tenmile Creeks and by field reconnaissance along Silver Creek. (Woodard-USGS)
Suggested Citation
Wilke, K.R., and Johnson, M.V., 1978, Map showing depth to water table, September 1976, and area inundated by the June 1975 flood, Helena Valley, Lewis and Clark County, Montana: U.S. Geological Survey Open-File Report 78-110, 2 Plates: 18.00 × 28.50 inches and 17.50 × 28.50 inches, https://doi.org/10.3133/ofr78110.
ISSN: 2331-1258 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Map showing depth to water table, September 1976, and area inundated by the June 1975 flood, Helena Valley, Lewis and Clark County, Montana |
| Series title | Open-File Report |
| Series number | 78-110 |
| DOI | 10.3133/ofr78110 |
| Year Published | 1978 |
| Language | English |
| Publisher | Geological Survey (U.S.) |
| Contributing office(s) | U.S. Geological Survey |
| Description | 2 Plates: 18.00 × 28.50 inches and 17.50 × 28.50 inches |
| Country | United States |
| State | Montana |
| County | Lewis and Clark County |
| Other Geospatial | Helena Valley |