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Legend (Water/OF_18_12_Geology_Groundwater_Resources_Elbert_County)

Alluvial Aquifer Wells by Depth (ft) (3)
<20 <20
20 - 50 20 - 50
51 - 100 51 - 100
>100 >100
Alluvial Aquifer Wells with Low-Confidence Locations by Depth (ft) (4)
<20 <20
20 - 50 20 - 50
51 - 100 51 - 100
>100 >100
Alluvial Aquifer Water Level Monitoring Wells (5)
Eolian Wells with Low-Confidence Locations by Depth (ft) (6)
20 - 50 20 - 50
51 - 100 51 - 100
>100 >100
Nussbaum Aquifer Wells by Depth (ft) (7)
<20 <20
20 - 50 20 - 50
51 - 100 51 - 100
101 - 150 101 - 150
>150 >150
Nussbaum Aquifer Water Level Monitoring Wells (8)
Nussbaum Aquifer Wells with Low-Confidence Locations by Depth (ft) (9)
<20 <20
20 - 50 20 - 50
51 - 100 51 - 100
101 - 150 101 - 150
>150 >150
Anthropogenic Deposits (11)
Alluvial-Fan Deposits (12)
Pediment Alluvium Deposits (13)
Eolian Sand Deposits (14)
Alluvium Connected to Active Drainages (15)
Eolian Silt Deposits (16)
Landslide and Colluvium Deposits (17)
Pliocene Early Quaternary Gravel Deposits (18)
Nussbaum Alluvium (19)
Alluvium base elevation points, elevation and depth (21)
Base of alluvium elevation, ft MSL (22)
50, Interpolated 50, Interpolated
100, Interpolated 100, Interpolated
50, Based on control points 50, Based on control points
100, Based on control points 100, Based on control points
Estimated thickness of alluvium (23)
Not Present Not Present
0 - 25 0 - 25
25 - 50 25 - 50
50 - 75 50 - 75
75 - 100 75 - 100
100 - 125 100 - 125
Nussbaum Alluvium Extent (25)
Nussbaum Alluvium Base Elevation (ft) (26)
Base of Nussbaum Alluvium (ft below surface) (27)
Not present Not present
0 - 50 0 - 50
50 - 100 50 - 100
100 - 150 100 - 150
150 - 200 150 - 200
200 - 250 200 - 250
> 250 > 250
High Plains Aquifer Wells (31)
<20 <20
20 - 50 20 - 50
51 - 100 51 - 100
101 - 150 101 - 150
>150 >150
High Plains Aquifer Wells with Low-Confidence Locations by Depth (ft) (32)
<20 <20
20 - 50 20 - 50
51 - 100 51 - 100
101 - 150 101 - 150
>150 >150
Ogallala Formation Intersecting Alluvium (34)
Ogallala Formation (35)
Ogallala Formation, covered Ogallala Formation, covered
Ogallala Formation, outcrop Ogallala Formation, outcrop
Ogalla Formation Extent (37)
Ogallala Formation Base Elevation (ft) (38)
Ogallala Formation Base (ft below surface) (39)
Not present Not present
0 - 50 0 - 50
50 - 100 50 - 100
100 - 150 100 - 150
150 - 200 150 - 200
200 - 250 200 - 250
> 250 > 250
Upper Paleogene Undivided Water Level Monitoring Wells (41)
Castle Rock Conglomerate, Wall Moutain Tuff, and Larkspur Conglomerate Undivided, Pecwl (42)
covered covered
outcrop outcrop
Upper Dawson Aquifer Wells by Depth (ft) (46)
<200 <200
200 - 300 200 - 300
301 - 400 301 - 400
401 - 500 401 - 500
>500 >500
Upper Dawson Aquifer Water Level Monitoring Wells (47)
Upper Dawson Aquifer Wells with Low -Confidence Locations by Depth (ft) (48)
<200 <200
200 - 300 200 - 300
301 - 400 301 - 400
401 - 500 401 - 500
>500 >500
Dawson Arkose Intersecting Alluvium (50)
Dawson Arkose (51)
Dawson Arkose, outcrop Dawson Arkose, outcrop
Dawson Arkose, covered Dawson Arkose, covered
Dawson Arkose Base Extent (53)
Dawson Arkose Base Elevation (ft) (54)
Base of Dawson Arkose (ft below surface) (55)
Not Present Not Present
0 - 250 0 - 250
240 - 500 240 - 500
500 - 750 500 - 750
750 - 1,000 750 - 1,000
> 1,000 > 1,000
Lower Dawson Aquifer Wells by Depth (ft) (58)
<200 <200
200 - 300 200 - 300
301 - 400 301 - 400
401 - 500 401 - 500
>500 >500
Lower Dawson Aquifer Water Level Monitoring Wells (59)
Lower Dawson Aquifer Wells with Low-Confidence Locations by Depth (ft) (60)
<200 <200
200 - 300 200 - 300
301 - 400 301 - 400
401 - 500 401 - 500
>500 >500
Denver Formation Upper Mudstone Confining Unit (62)
Denver Formation Upper Fan Intersecting Alluvium (63)
Denver Formation Upper Fan (64)
Denver Formation Upper Fan, outcrop Denver Formation Upper Fan, outcrop
Denver Formation Upper Fan, covered Denver Formation Upper Fan, covered
Denver Formation Upper Fan Top Extent (67)
Denver Formation Upper Fan Top Elevation (ft) (68)
Top of Denver Formation Upper Fan (ft below surface) (69)
Not Present Not Present
0 - 250 0 - 250
250 - 500 250 - 500
500 - 750 500 - 750
750 - 1,000 750 - 1,000
> 1,000 > 1,000
Denver Formation Upper Fan Base Extent (71)
Denver Formation Upper Fan Base Elevation (ft) (72)
Base of Denver Formation Upper Fan (ft below surface) (73)
Not Present Not Present
0 - 250 0 - 250
250 - 500 250 - 500
500 - 750 500 - 750
750 - 1,000 750 - 1,000
1,000 - 1,250 1,000 - 1,250
> 1,250 > 1,250
Denver Aquifer Wells by Depth (ft) (77)
<200 <200
200 - 300 200 - 300
301 - 400 301 - 400
401 - 500 401 - 500
>500 >500
Denver Aquifer Water Level Monitoring Wells (78)
Denver Aquifer Wells with Low-Confidence Locations by Depth (ft) (79)
<200 <200
200 - 300 200 - 300
301 - 400 301 - 400
401 - 500 401 - 500
>500 >500
Denver Formation Middle Fan Intersecting Alluvium (81)
Denver Formation Middle Fan (82)
Denver Formation Middle Fan, covered Denver Formation Middle Fan, covered
Denver Formation Middle Fan, outcrop Denver Formation Middle Fan, outcrop
Arapahoe Aquifer Wells by Depth (ft) (86)
<200 <200
200 - 500 200 - 500
501 - 750 501 - 750
751 - 1000 751 - 1000
>1000 >1000
Arapahoe Aquifer Water Level Monitoring Wells (87)
Arapahoe Aquifer Wells with Low-Confidence Locations by Depth (ft) (88)
<200 <200
200 - 500 200 - 500
501 - 750 501 - 750
751 - 1000 751 - 1000
>1000 >1000
Denver Formation Lower Fan Intersecting Alluvium (90)
Denver Formation Lower Fan (91)
Denver Formation Lower Fan, outcrop Denver Formation Lower Fan, outcrop
Denver Formation Lower Fan, covered Denver Formation Lower Fan, covered
Denver Formation Lower Fan Top Extent (94)
Denver Formation Lower Fan Top Elevation (ft) (95)
Top of Denver Formation Lower Fan (ft below surface) (96)
Not Present Not Present
0 - 250 0 - 250
250 - 500 250 - 500
500 - 750 500 - 750
750 - 1,000 750 - 1,000
1,000 - 1,250 1,000 - 1,250
1,250 - 1,500 1,250 - 1,500
> 1,500 > 1,500
Denver Formation Lower Fan Base Extent (98)
Denver Formation Lower Fan Base Elevation (ft) (99)
Base of Denver Formation Lower Fan (ft below surface) (100)
Not Present Not Present
0 - 500 0 - 500
500 - 1,000 500 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 2,000 1,500 - 2,000
> 2,000 > 2,000
Laramie Formation Water Level Monitoring Wells (103)
Laramie Formation Wells with Low-Confidence Locations by Depth (ft) (104)
<200 <200
200 - 500 200 - 500
501 - 750 501 - 750
751 - 1000 751 - 1000
>1000 >1000
Laramie-Fox Hills Aquifer Wells by Depth (ft) (105)
<200 <200
200 - 500 200 - 500
501 - 750 501 - 750
751 - 1000 751 - 1000
>1000 >1000
Laramie-Fox Hills Aquifer Water Level Monitoring Wells (106)
Laramie-Fox Hills Aquifer Wells with Low-Confidence Locations by Depth (ft) (107)
<200 <200
200 - 500 200 - 500
501 - 750 501 - 750
751 - 1000 751 - 1000
>1000 >1000
Upper Laramie Formation Confining Unit (109)
Laramie-Fox Hills Intersecting Alluvium (110)
Lower Laramie Formation and Fox Hills Sandstone (111)
Laramie-Fox Hills aquifer, outcrop Laramie-Fox Hills aquifer, outcrop
Laramie-Fox Hills aquifer, covered Laramie-Fox Hills aquifer, covered
Lower Laramie Formation Top Extent (113)
Lower Laramie Formation Top Elevation (ft) (114)
Top of Lower Laramie Formation (ft below surface) (115)
Not Present Not Present
0 - 500 0 - 500
500 - 1,000 500 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 2,000 1,500 - 2,000
2,000 - 2,500 2,000 - 2,500
> 2,500 > 2,500
Fox Hills Sandstone Top Extent (118)
Fox Hills Sandstone Top Elevation (ft) (119)
Top of Fox Hills Sandstone (ft below surface) (120)
Not Present Not Present
0 - 500 0 - 500
500 - 1,000 500 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 2,000 1,500 - 2,000
2,000 - 2,500 2,000 - 2,500
> 2,500 > 2,500
Fox Hills Sandstone Base Extent (122)
Fox Hills Sandstone Base Elevation (ft) (123)
Base of Fox Hills Sandstone (ft below surface) (124)
Not Present Not Present
0 - 500 0 - 500
500 - 1,000 500 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 2,000 1,500 - 2,000
2,000 - 2,500 2,000 - 2,500
2,400 - 3,000 2,400 - 3,000
> 3,000 > 3,000
Upper Pierre Shale Wells by Depth (ft) (127)
<20 <20
20 - 50 20 - 50
51 - 100 51 - 100
>100 >100
Upper Pierre Shale Low-Confidence Location Wells by Depth (ft) (128)
<20 <20
20 - 50 20 - 50
51 - 100 51 - 100
>100 >100
Upper Pierre Aquifer Wells by Depth (ft) (129)
<20 <20
20 - 50 20 - 50
51 - 100 51 - 100
>100 >100
Upper Pierre Aquifer Low-Confidence Location Wells by Depth (ft) (130)
10 - 19 10 - 19
20 - 50 20 - 50
51 - 100 51 - 100
101 - 800 101 - 800
Pierre Shale Upper Unit (132)
Upper Pierre Intersecting Alluvium (133)
Upper Pierre sandstone (134)
Upper Pierre sandstone, covered Upper Pierre sandstone, covered
Upper Pierre sandstone, outcrop Upper Pierre sandstone, outcrop
Pierre Shale Main Unit (135)
Upper Pierre sand Top Extent (138)
Upper Pierre sand Top Elevation (ft) (139)
Top of Upper Pierre sandstone (ft below surface) (140)
not present not present
0 - 500 0 - 500
500 - 1,000 500 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 2,000 1,500 - 2,000
2,000 - 2,500 2,000 - 2,500
2,500 - 3,000 2,500 - 3,000
>3,000 >3,000
Upper Pierre sand Base Extent (142)
Upper Pierre sand Base Elevation (ft) (143)
Base of Upper Pierre sandstone (ft below surface) (144)
Not Present Not Present
0 - 500 0 - 500
500 - 1,000 500 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 2,000 1,500 - 2,000
2,000 - 2,500 2,000 - 2,500
2,500 - 3,000 2,500 - 3,000
3,000 - 3,500 3,000 - 3,500
>3,500 >3,500
Depth to Top of Niobrara Formation (ft below surface) (145)
<3,000 <3,000
3,000-4,000 3,000-4,000
4,000-5,000 4,000-5,000
5,000-6,000 5,000-6,000
6,000-7,000 6,000-7,000
7,000-8,000 7,000-8,000
>8,000 >8,000
Depth to Top of Dakota-Cheyenne Aquifer (ft below surface) (146)
< 4,000 < 4,000
4,000 - 5,000 4,000 - 5,000
5,000 - 6,000 5,000 - 6,000
6,000 - 7,000 6,000 - 7,000
7,000 - 8,000 7,000 - 8,000
8,000 - 9,000 8,000 - 9,000
> 9,000 > 9,000
Elbert County Average Annual Precipitation 1981-2010 (in) (148)
14 14
15 15
16 16
17 17
18 18
19 19
20 20
Wells pH (151)
<6.5 <6.5
6.5 - 8.5 6.5 - 8.5
>8.5 >8.5
Wells Total Dissolved Solids in mg/L (152)
<250 <250
250 - 500 250 - 500
500 - 1500 500 - 1500
1500 - 2500 1500 - 2500
>2500 >2500
Wells Flouride in mg/L (154)
<1 <1
1.0 - 2.0 1.0 - 2.0
2.0 - 4.0 2.0 - 4.0
>4 >4
Wells Flouride not detected (155)
Wells Sulfate mg/L (157)
<100 <100
100 - 250 100 - 250
250 - 1000 250 - 1000
>1000 >1000
Wells Sulfate not detected (158)
Wells Aluminum mg/L (160)
<0.02 <0.02
0.02 - 0.05 0.02 - 0.05
0.05 - 0.075 0.05 - 0.075
>0.075 >0.075
Wells Aluminum not detected (161)
Wells Arsenic mg/L (163)
0.005 0.005
0.005 - 0.01 0.005 - 0.01
0.01 - 0.012 0.01 - 0.012
>0.012 >0.012
Wells Arsenic not detected (164)
Wells Iron mg/L (166)
<0.15 <0.15
0.15 - 0.30 0.15 - 0.30
0.30 - 5.0 0.30 - 5.0
>5.0 >5.0
Wells Iron not detected (167)
Wells Manganese mg/L (169)
<0.025 <0.025
0.025 - 0.05 0.025 - 0.05
0.05 - 0.10 0.05 - 0.10
>0.10 >0.10
Wells Manganese not detected (170)
Wells Selenium mg/L (172)
<0.025 <0.025
0.025 - 0.05 0.025 - 0.05
0.05 - 0.06 0.05 - 0.06
>0.06 >0.06
Wells Selenium not detected (173)
Wells Thallium mg/L (175)
<0.001 <0.001
0.001 - 0.002 0.001 - 0.002
0.002 - 0.01 0.002 - 0.01
>0.01 >0.01
Wells Thallium not detected (176)
Wells Uranium mg/L (178)
<0.015 <0.015
0.015 - 0.03 0.015 - 0.03
0.03 - 0.06 0.03 - 0.06
>0.06 >0.06
Wells Uranium not detected (179)
Wells Radium 226+228 picoCurries/L (180)
<0 <0
1 - 5 1 - 5
5 - 20 5 - 20
>20 >20
Wells Gross Alpha picoCurries/L (181)
<5 <5
5 - 15 5 - 15
15 - 20 15 - 20
>20 >20
Springs pH (183)
<6.5 <6.5
6.5 - 8.5 6.5 - 8.5
>8.5 >8.5
Springs Aluminum ppm (184)
<0.02 <0.02
0.02 - 0.05 0.02 - 0.05
0.05 - 0.08 0.05 - 0.08
>0.08 >0.08
Springs Iron ppm (185)
<0.15 <0.15
0.15 - 0.30 0.15 - 0.30
0.30 - 1.0 0.30 - 1.0
>1.0 >1.0
Springs Manganese ppm (187)
<0.25 <0.25
0.025 - 0.05 0.025 - 0.05
0.05 - 0.10 0.05 - 0.10
>0.10 >0.10
Springs Manganese not detected (188)
Springs Thallium ppm (190)
<0.001 <0.001
0.001 - 0.002 0.001 - 0.002
0.002 - 0.01 0.002 - 0.01
>0.01 >0.01
Springs Thallium not detected (191)
Springs Uranium ppm (193)
<0.015 <0.015
0.015 - 0.03 0.015 - 0.03
0.03 - 0.06 0.03 - 0.06
>0.06 >0.06
Springs Uranium not detected (194)
Elbert County CDSS Water Level Monitoring Wells (196)
Elbert County DWR Permitted Wells with CGS Aquifer Designations (197)
Elbert County Water Quality Monitoring Wells (198)
K-T (PE) Boundary trace (200)
Elbert County Geologic Map (201)
af: Anthropogenic deposits af: Anthropogenic deposits
Qal: Alluvium, connected to active drainages Qal: Alluvium, connected to active drainages
Qaf: Alluvial-fan deposits Qaf: Alluvial-fan deposits
Qap: Pediment alluvium deposits Qap: Pediment alluvium deposits
Qes: Eolian sand deposits Qes: Eolian sand deposits
Qel: Eolian silt deposits Qel: Eolian silt deposits
Qls: Landslide deposits Qls: Landslide deposits
Qc: Colluvium Deposits Qc: Colluvium Deposits
Qcs: Colluvium and sheetwash deposits Qcs: Colluvium and sheetwash deposits
Qsw: Sheetwash deposits Qsw: Sheetwash deposits
Qn: Nussbaum Alluvium Qn: Nussbaum Alluvium
No: Ogallala Formation No: Ogallala Formation
PEcr: Castle Rock Conglomerate PEcr: Castle Rock Conglomerate
PEwm: Wall Mountain Tuff PEwm: Wall Mountain Tuff
PElc: Larkspur Conglomerate PElc: Larkspur Conglomerate
PEda: Dawson Arkose PEda: Dawson Arkose
PEdum: Denver Formation Upper Mudstone PEdum: Denver Formation Upper Mudstone
PEdu: Denver Formation Upper Fan PEdu: Denver Formation Upper Fan
PEKdm: Denver Formation Middle Fan PEKdm: Denver Formation Middle Fan
Kdl: Denver Formation Lower Fan Kdl: Denver Formation Lower Fan
Klu: Laramie Formation upper shale Klu: Laramie Formation upper shale
Kll: Laramie Formation lower sandstone Kll: Laramie Formation lower sandstone
Kfh: Fox Hills Sandstone Kfh: Fox Hills Sandstone
Kpu: Pierre Shale upper unit Kpu: Pierre Shale upper unit
Kps: Upper Pierre sandstone Kps: Upper Pierre sandstone
Kpm: Pierre Shale main unit Kpm: Pierre Shale main unit