Coconino County Cinder Lake Investigation

Jamie P. Macy, Lee Amoroso, Jeff Kennedy, and Joel Unema

U.S. Geological SurveyIn cooperation with Coconino County, AZ

and the U.S. Forest Service

Study Area

Schultz Fire

July 19, 2010 flood from Schultz Fire

runoff

Ditchesmove water to

Cinder Lake AreaCampbell

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.

Approach• Monitoring Wells– 4 boreholes

• Geophysical Surveys – TEM– Other geophysical techniques (CSAMT and GPR)

• Stream gages– 2 USGS stream-gages

• USGS Cooperative Support– Gravity Measurements– Report Publication

Cinder Lake Investigation

Drilling

Sunset Crater Well

0' - 700' Volcanics

700' - 1000' Kaibab Limestone

1000' - 1830' Coconino Sandstone

1830' - 2200' 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' - 1400' Coconino Sandstone

1400' - 1802' Schnebly Hill and Supai Formations

Marijka Well inDoney 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' - 1740'

Coconino Sandstone

1740' - 2295'

Schnebly Hill Formation

Doney Park WellDPW-1

Well Cl-1Black 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'

12.0' - 12.5'

12.5' - 20.0'

20.0' - 24.0'

24.0' - 25.5'

25.5' - 29.5'

29.5' - 31.0'

31.0' - 42.5'

Provisional Data-Subject to Change

Well Cl-3

0' - 3.5'

3.5' - 5.0'

5.0' - 6.0'

6.0' - 12.0'

12.0' - 16.0'

16.0' - 21.0'

21.0' - 21.5'

21.5' - 23.0'

23.0' - 27.0'

27.0' - 29.0'

29.0' - 41.0'

Black Cinders

Sandy CindersSand, Silt, and Clay

Silty-Sand

Sandy Cinders

SandSandy Cinders

Silty-Sand

Basalt

Silty-Sand

Cinders

56%

% Porosity

38%52%

34%

52%

36%

43%

38%

Water Storage acre-ft

588 acre-ft171 acre-ft156 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 outfitted with telemetry

Provisional Data-Subject to Change

USGS Streamflow-Gages•Copeland Ditch

•Girl’s Ranch Ditch

• Gages Installed August 5, 2011• Copeland Ditch 2011 – August-September ~44 acre-ft– October-present ~25 acre-ft

• Girl’s 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

USGSOpen-File Report

http://pubs.usgs.gov/of/2012/1018/

Thank You & QuestionsJamie P MacyUSGS - Flagstaff Programs2255 N. Gemini Dr.Flagstaff, AZ 86001Email: jpmacy@usgs.govPhone: 928-556-7276