Portneuf Marsh Creek Aquifer Boundary
2025-12-10T00:00:00
2025-12-10T00:00:00
This boundary of the Portneuf/Marsh Creek aquifer was updated by IDWR to support ongoing work with the Portneuf River Basin hydrologic study. The boundary was manually delineated through an analysis of geological maps, well completion reports, and topographic data. The primary geological units that comprise the aquifer include basalt flows and alluvial deposits within the valley, while sedimentary and carbonate formations associated with the Basin and Range extension form the underlying bedrock and surrounding mountain ranges. Utilizing data from the 2012 Geologic Map of Idaho (IGS Map 9), the aquifer's extent was initially outlined by compiling identified water-bearing units.
Well completion reports were examined across the study area to validate the consistency between subsurface hydrostratigraphy and surface geological units depicted in geological maps. Generally, water-producing strata described in well reports correlated with the mapped geological formations. In regions where surface geology was characterized by loess deposits, well reports provided supplementary data to refine aquifer boundary delineations.
The interaction between primary water-bearing units and adjacent bedrock formations remains incompletely understood. Therefore, the delineated aquifer boundary encompasses areas where primary aquifer materials are confirmed, particularly where active wells exist. Notably, certain regions, such as those south of Lava Hot Springs and north of Inkom, feature numerous domestic wells completed in bedrock formations, suggesting they are outside the main valley aquifer system.
In areas with limited well data, topographic features served as the primary criteria for boundary determination. In narrow valleys, an elevation contour approximately 200 feet above the valley floor delineated the aquifer's edge. Between Bancroft and Grace, the topographic divide defines the boundary, though additional groundwater level data is required to precisely locate the groundwater divide in this segment.
Geospatial Technology Section
Idaho Department of Water Resources
GIS
322 East Front Street
Boise
Idaho
83720
US
gisinfo@idwr.idaho.gov
(208) 287-4800
(208) 287-6700
8:00 AM - 5:00 PM
Geospatial Technology Section
Portneuf
Marsh Creek
Aquifer
Portneuf River Basin
Hydrologic Study
This boundary of the Portneuf/Marsh Creek aquifer was updated by IDWR to support ongoing work with the Portneuf River Basin hydrologic study. The boundary was manually delineated through an analysis of geological maps, well completion reports, and topographic data.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This boundary of the Portneuf/Marsh Creek aquifer was updated by IDWR to support ongoing work with the Portneuf River Basin hydrologic study. The boundary was manually delineated through an analysis of geological maps, well completion reports, and topographic data. The primary geological units that comprise the aquifer include basalt flows and alluvial deposits within the valley, while sedimentary and carbonate formations associated with the Basin and Range extension form the underlying bedrock and surrounding mountain ranges. Utilizing data from the 2012 Geologic Map of Idaho (IGS Map 9), the aquifer's extent was initially outlined by compiling identified water-bearing units.</SPAN></P><P><SPAN>Well completion reports were examined across the study area to validate the consistency between subsurface hydrostratigraphy and surface geological units depicted in geological maps. Generally, water-producing strata described in well reports correlated with the mapped geological formations. In regions where surface geology was characterized by loess deposits, well reports provided supplementary data to refine aquifer boundary delineations.</SPAN></P><P><SPAN>The interaction between primary water-bearing units and adjacent bedrock formations remains incompletely understood. Therefore, the delineated aquifer boundary encompasses areas where primary aquifer materials are confirmed, particularly where active wells exist. Notably, certain regions, such as those south of Lava Hot Springs and north of Inkom, feature numerous domestic wells completed in bedrock formations, suggesting they are outside the main valley aquifer system.</SPAN></P><P><SPAN>In areas with limited well data, topographic features served as the primary criteria for boundary determination. In narrow valleys, an elevation contour approximately 200 feet above the valley floor delineated the aquifer's edge. Between Bancroft and Grace, the topographic divide defines the boundary, though additional groundwater level data is required to precisely locate the groundwater divide in this segment.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
Idaho Department of Water Resources
This boundary of the Portneuf/Marsh Creek aquifer was updated by IDWR to support ongoing work with the Portneuf River Basin hydrologic study. The boundary was manually delineated through an analysis of geological maps, well completion reports, and topographic data.
Geospatial Technology Section
Idaho Department of Water Resources
GIS
322 East Front Street
Boise
Idaho
83720
US
gisinfo@idwr.idaho.gov
(208) 287-4800
(208) 287-6700
8:00 AM - 5:00 PM
Geospatial Technology Section
Geospatial Technology Section
Geospatial Technology Section
Esri ArcGIS 13.3.4.52636
1
-112.391106
-111.700304
43.082075
42.332238
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Access and Use Constraint: The Idaho Department of Water Resources is making this data available as a public service. The Idaho Department of Water Resources strives to ensure that all technical data and other information made available to the public is accurate, complete and in conformance with the Idaho Public Records Act. </SPAN></P><P><SPAN>Neither the Department of Water Resources nor the State of Idaho, however, assumes any legal responsibility for the accuracy or completeness of the information contained on this site. </SPAN></P><P><SPAN>Persons using information from this site for official purposes, or other purposes, for which accuracy and completeness are required, are hereby notified that they should first verify the information with the public records or other primary sources from which the information was obtained. </SPAN></P><P><SPAN>Please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the most recent copy of both data and metadata. Acknowledgement of IDWR in any products derived from this dataset is appreciated.</SPAN></P></DIV></DIV></DIV>
Geospatial Technology Section
Idaho Department of Water Resources
GIS
322 East Front Street
Boise
Idaho
83720
US
gisinfo@idwr.idaho.gov
(208) 287-4800
(208) 287-6700
8:00 AM - 5:00 PM
Geospatial Technology Section
Geospatial Technology Section
This boundary of the Portneuf/Marsh Creek aquifer was updated by IDWR to support ongoing work with the Portneuf River Basin hydrologic study. The boundary was manually delineated through an analysis of geological maps, well completion reports, and topographic data. The primary geological units that comprise the aquifer include basalt flows and alluvial deposits within the valley, while sedimentary and carbonate formations associated with the Basin and Range extension form the underlying bedrock and surrounding mountain ranges. Utilizing data from the 2012 Geologic Map of Idaho (IGS Map 9), the aquifer's extent was initially outlined by compiling identified water-bearing units.
Well completion reports were examined across the study area to validate the consistency between subsurface hydrostratigraphy and surface geological units depicted in geological maps. Generally, water-producing strata described in well reports correlated with the mapped geological formations. In regions where surface geology was characterized by loess deposits, well reports provided supplementary data to refine aquifer boundary delineations.
The interaction between primary water-bearing units and adjacent bedrock formations remains incompletely understood. Therefore, the delineated aquifer boundary encompasses areas where primary aquifer materials are confirmed, particularly where active wells exist. Notably, certain regions, such as those south of Lava Hot Springs and north of Inkom, feature numerous domestic wells completed in bedrock formations, suggesting they are outside the main valley aquifer system.
In areas with limited well data, topographic features served as the primary criteria for boundary determination. In narrow valleys, an elevation contour approximately 200 feet above the valley floor delineated the aquifer's edge. Between Bancroft and Grace, the topographic divide defines the boundary, though additional groundwater level data is required to precisely locate the groundwater divide in this segment.
Geospatial Technology Section
Idaho Department of Water Resources
GIS
322 East Front Street
Boise
Idaho
83720
US
gisinfo@idwr.idaho.gov
(208) 287-4800
(208) 287-6700
8:00 AM - 5:00 PM
Geospatial Technology Section
False
Geospatial Technology Section
Enterprise Geodatabase Feature Class
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Projected
GCS_North_American_1983
Linear Unit: Meter (1.000000)
NAD_1983_Idaho_TM
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