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Gilcrest/LaSalle High Groundwater Area  
DWR > Division Offices > Division 1 (Greeley) > Gilcrest/LaSalle High Groundwater Area

Click here to view and export all (historic and recent) groundwater level data for the Gilcrest study.  Wells can be viewed and downloaded using Colorado’s Decision Support System (CDSS) groundwater water levels tool. The CDSS tool provides groundwater level data, which can be viewed in graphs or tables, and can be exported as a PDF or data files (CSVs). A map of the current monitoring network can be found here.

Background and Data Collection Effort
In the late 2000’s landowners in the Gilcrest/LaSalle area began to relay concerns about high groundwater levels to state officials.  Shallow groundwater was damaging crops, flooding basements, and impacting private septic systems and the Town of Gilcrest Wastewater Treatment Plant. In the 2012 session, the Colorado Legislature passed HB12-1278, which directed the Colorado Water Institute (CWI) at Colorado State University (CSU) to perform a study of the South Platte Alluvial aquifer.  Concurrent with the CWI study, the Colorado Division of Water Resources (DWR) began to compile historical groundwater level data, monitor current groundwater levels, and characterize the hydrogeology within the area of interest with funding from the Colorado Water Conservation Board (CWCB).  The project included three years (2012-2014) of intensive data collection and monthly summary reports completed by DWR. A summary report of these data can be found in the “Studies” section at the bottom of this page.

In 2014, the Colorado Geological Survey (CGS) produced a hydrogeologic characterization report to refine the hydrogeology of the study area, analyze aquifer properties, and determine groundwater flow directions. CGS published addenda in 2015 and 2017 to include more recent water-level data.  In 2015, Brown and Caldwell contracted with CWCB to produce a report summarizing relationships between climate, geology, hydrology, water management of the area, and groundwater levels. A link to the final Brown & Caldwell report, and the initial CGS report and addenda are in the “Studies” Section.

DWR continues to measure a sub-set of wells within the area and manages the submission of water-level data from the Colorado Department of Agriculture (CDA), CSU, and the Town of Gilcrest.  The following report includes the most recent water level measurements for wells in the Gilcrest High Groundwater Area. The study area map shows the locations of all of the wells where groundwater levels are currently being collected. Different colors and symbols denote different cooperative agencies’ wells. Recharge ponds, seeps, and diversion ditches are also displayed.

Groundwater Level Data
Groundwater level information include both historic and project-specific measurements from groundwater monitoring wells. Data providers include the Town of Gilcrest, DWR, CSU, CDA, the Central Colorado Water Conservancy District (CCWCD), and the US Geological Survey (USGS). The earliest measurements are from the 1930s, and periodic/annual measurements extend through the early 1990s. In October 2012 data providers began measuring water levels on a monthly-basis. The approximately 70 square-mile groundwater monitoring network is located near Gilcrest and LaSalle, southeast of the South Platte River. Currently, there are 61 monitoring wells within the network. Graphs of water levels measured between 2012-2016 can be found in the “2012-2016 Gilcrest Data Summary” found in the “Studies” Section.

Current and Former Monitoring Well Names
The Gilcrest monitoring network is possible due to many data providers and cooperative well owners. Because of the collaborative nature of the project, sometimes network wells are dropped/added and can have multiple names. This table connects older and alternative well names with those in the CDSS Groundwater water levels tool and the map of the current monitoring network.  In the map, some of the CDSS GW tool names have been shortened (i.e. “LSP-041 04N6614BAA” was shortened to “LSP-041”), but each name includes key words to allow for its recognition.

Recently added wells that do not have alternative names include: nine CSU wells (CSU MW1 to CSU MW9), Gilcrest Elementary, Gilcrest 45115, Gilcrest 1 -13119-F, Gilcrest 2 -13118, Gilcrest Brown Well, GWWTP-E, GWWTP-S, GWWTP-W, Kieser 3-0632, LSP-104.

 2018 Well Name in CDSS GW tool

 Former Name

 Alternative Name

 2018 Well Name in CDSS GW tool

 Former Name

Alternative Name

BENSON WELL 1-7164

 110-2

 F23

CDA_WL-M-001

WL-M-001

CDA-001

BETZ WELL 6904

 39-3

 C54

CDA_WL-M-002

WL-M-002

CDA-002

BROWN WELL 0884

 32-1

 C32

CDA_WL-M-003A

WL-M-003A

CDA-003A

CARLSON WELL

 36-1

 C42

CDA_WL-M-006A

WL-M-006A

CDA-006A

DINNER WELL 5-11833

 37-4

 C48

CDA_WL-M-007

WL-M-007

CDA-007

DINNER WELL 8-11830

 37-1

 C54

CDA_WL-M-008

WL-M-008

CDA-008

EWING WELL 1-19923

 30-2

 C34

CDA_WL-M-009

WL-M-009

CDA-009

FRITZLER WELL

 25-5

 C19

CDA_WL-M-010

WL-M-010

CDA-010

GREIMAN 11224-R

 207362

 Greiman

CDA_WL-M-011

WL-M-011

CDA-011

KNAUB WELL 2-8737

 39-1

 --

CDA_WL-M-401

WL-M-401

CDA-401

LORENZ 12938-R

 207025

 Lorenz

CDA_WL-M-501

WL-M-501

CDA-501

MCLEOD WELL 3

 109-3

 F19

LSP-034

CSU WP 166

--

RAY WELL NO 1

 40-1

 --

LSP-035

15-1

--

SB00506532DDB

 NAWQA #11

 --

LSP-039

 CSU WP 157

Well ID 167

STEPHENS

 29-1

 C28

LSP-041

17-1 

--

STEVENSON

 27-1

 C21

LSP-043

CSU WP 162

Well ID 171

STROMBERGER 

 38-2

C50

LSP-057

CSU WP 167

Well ID 157

WATSON WELL

 208-9

 C20

LSP-101

16-1

--

WERNING WELL

 34-1

 C39

LSP-102

18-1

--

WYATT WELL

 30-1

 C30

LSP-103

144-4

--

Locations of High Groundwater
In addition to groundwater level monitoring, DWR has identified wells where water levels are consistently or recently within ten (10) feet or five (5) feet of ground surface:

Within 10 ft of ground: CDA-003A, CDA-009, CDA-401, CDA-501, CSU MW4, CSU MW6, Dinner 8-11830, Gilcrest Elementary, Gilcrest 45115, GWWTP-E, GWWTP-S, LSP-034, LSP-057, LSP-101, SB00506532DDB, Werning Well

Within 5 ft of ground: CSU MW2, CSU MW3, CSU MW5, CSU MW8, CSU MW9, Greiman, GWWTP-W, Lorenz 12938-R,
LSP-102, LSP-104 

Climate Data
Precipitation and climate are major facets of the hydrologic cycle and groundwater recharge and provide environmental perspective for groundwater level data. The Northern Colorado Water Conservancy District (NCWCD) provides comprehensive climate data collected at local weather stations in the Gilcrest area, which can be found
here.  The two stations closest to Gilcrest are 1) Gilcrest #105 station, located southwest of Gilcrest between the Western Mutual and Farmer’s Independent Ditch, and 2) Greeley West #224, located southwest of Greeley and north of the US Highway 34 by-pass.

Diversion and Recharge Data
Seepage from both the recharge ponds and ditches influence groundwater recharge and thus the groundwater levels. There are a number of diversion and recharge ditches located in the study area. Links to Colorado diversion and recharge databases, maps of ditches, and summaries of the 2012-2016 recharge and diversion data from are included the 2012-2016 Gilcrest Data Summary.

Contact
Please contact the Hydrogeology Section of the Division of Water Resources with any questions or for additional information.

Studies
1. Sterling & Gilcrest LaSalle High Groundwater Analysis - Brown & Caldwell- Final Report
2. 2014 CGS Hydrogeologic Characterization Report
3. 2015 CGS Addendum to Hydrogeologic Characterization Report
4. 2017 CGS Addendum to Hydrogeologic Characterization Report
5. Colorado State University Pilot Study Summary (2015)
6.
2012-2016 Gilcrest Data Summary
7. House Bill 15-1178 Emergency Dewatering Grant Program Report
8. House Bill 12-1278 Study of the South Platte River Alluvial Aquifer
9. Final Interpretative Report on the Airborne Electromagnetic Survey of the Gilcrest and La Salle Areas

Presentations
 1. Gilcrest/LaSalle Groundwater Investigation (September 9, 2014)
 2. Presentation to South Platte Roundtable Groundwater Committee (July 9, 2013)
 3. Initial Presentation (January 24, 2013)