Coconino County Cinder Lake Investigation Jamie P. Macy, Lee Amoroso, Jeff Kennedy, and Joel Unema U.S. Geological Survey In cooperation with Coconino County, AZ and the U.S. Forest Service

Study Area

Schultz Fire

July 19, 2010 flood from Schultz Fire runoff

Ditches move water to Cinder Lake Area Campbell Copeland

Objective The objective of this study is to determine the depth of cinders to basalt in the Cinder Lake area for potential water storage of runoff from the Schultz Fire burn area in northeast Flagstaff, AZ. The objective of this study is to determine the depth of cinders to basalt in the Cinder Lake area for potential water storage of runoff from the Schultz Fire burn area in northeast Flagstaff, AZ.

Approach Monitoring Wells Monitoring Wells – 4 boreholes Geophysical Surveys Geophysical Surveys – TEM – Other geophysical techniques (CSAMT and GPR) Stream gages Stream gages – 2 USGS stream-gages USGS Cooperative Support USGS Cooperative Support – Gravity Measurements – Report Publication

Cinder Lake Investigation

Drilling

Sunset Crater Well 0' - 700'Volcanics 700' 'Kaibab Limestone 1000' 'Coconino Sandstone 1830' 'Supai Formation 0' - 120'Silt, sand 120' - 180'Gravel and Cinders 180' - 210'Black cinders. 210' - 300'Basalt 300' - 580'Kaibab Limestone 580' - 740'Toroweap Formation 740' 'Coconino Sandstone 1400' 'Schnebly Hill and Supai Formations Marijka Well in Doney Park 0' - 20'Tan silt and basaltic sand with minor basalt gravel. 20' - 55'Vesicular basalt. 55' - 205' Hard, dense basalt. 205' - 260' Moenkopi Formation 260' - 560' Kaibab Limestone 560' ' Coconino Sandstone 1740' ' Schnebly Hill Formation Doney Park Well DPW-1

Well Cl-1 Black Cinders Sand and Silt Sand, Silt, and Clay Cinders and Clay Black Cinders Large Black Cinders Sand Large Black Cinders Silty-Sand Basalt 0' - 2.5' 2.5' - 9.5' 9.5' ' 12.0' ' 12.5' ' 20.0' ' 24.0' ' 25.5' ' 29.5' ' 31.0' ' Provisional Data-Subject to Change

Well Cl-3 0' - 3.5' 3.5' - 5.0' 5.0' - 6.0' 6.0' ' 12.0' ' 16.0' ' 21.0' ' 21.5' ' 23.0' ' 27.0' ' 29.0' ' Black Cinders Sandy Cinders Sand, Silt, and Clay Silty-Sand Sandy Cinders Sand Sandy Cinders Silty-Sand Basalt Silty-Sand Cinders 56% % Porosity 38% 52% 34% 52% 36% 43% 38% Water Storage acre-ft 588 acre-ft 171 acre-ft 156 acre-ft 612 acre-ft 456 acre-ft 1092 acre-ft 432 acre-ft 258 acre-ft Estimated total storage for study area is ~4,000 acre-ft Provisional Data-Subject to Change

No water in Wells & Fractured Basalt

Water-Level Monitoring Equipment Wells are outfitted with pressure transducers for continuous water-level monitoring Wells are outfitted with pressure transducers for continuous water-level monitoring Wells outfitted with telemetry Wells outfitted with telemetry Provisional Data-Subject to Change

USGS Streamflow-Gages Copeland Ditch Copeland Ditch Girls Ranch Ditch Girls Ranch Ditch

Gages Installed August 5, 2011 Copeland Ditch 2011 – August-September ~44 acre-ft – October-present ~25 acre-ft Girls Ranch Ditch 2011 – September ~6 acre-ft USGS Streamflow-Gages

Geophysical Investigation

TEM Well 3Well 1Well 2 Basalt Cinder and Alluvial Deposits

Gravity 19 gravity measurement locations 7 wells (blue dots), other 12 (red dots) located throughout Cinder Lake Absolute and relative measurements Is water moving vertically or horizontally?

Gravity Green dots ~ 2.5 ft of water added to the subsurface Yellow dots - little to no water added to the subsurface Red dots – no water added to the subsurface PROVISIONAL DATA – SUBJECT TO CHANGE

USGS Open-File Report pubs.usgs.gov/of/2012/1018 /

Thank You & Questions Jamie P Macy USGS - Flagstaff Programs 2255 N. Gemini Dr. Flagstaff, AZ Phone: