FLOOD05850

• County: Montezuma
• Stream Name: Dolores River
• Basin: San Juan/Dolores
• Title: Field Report - The Dolores River
• Date: 11/1/2001
• Prepared By: CWCB, DNR
• Floodplain - Doc Type: Floodplain Report/Masterplan

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DOLORES RIVER FLOOD HAZARD REVIEW
October 2001

By

Colorado Water Conservation Board

Introduction
The Colorado Water Conservation Board (CWCB) has received requests from a number
of entities regarding floodplain activities in the Dolores River valley within Montezuma
County, Colorado. The requests generally relate to the CWCB reviewing technical
information (floodplain information) and associated flood risks for several gravel mining
pits within the river valley. The CWCB is hereby responding to flood related questions
such as "What is the Dolores River floodplain for the reach upstream of Dolores?" and
"Is the current floodplain information representative of conditions that exist today?" The
locations of the gravel pits in question are referred to as Sites 1, 2,and 3, which are shown
on Map 1. Site number 2 is also known as the Line Camp Gravel Pit.

To gain background information on the individual sites in question, the CWCB staff held
discussions with interested parties. The interested parties are:
. Montezuma County elected officials and staff
. Colorado State Representative Mark Larson
~ ,Jo.hn Liou, FEMA Region 8 '
. Pat Kantor, Chairperson CF AR (Citizen for Accountability & Responsibility)
~ J ames Preston, Attorney
. Ron Cattany, Colorado Department of Natural Resources, and
. Four States Aggregates (gravel mine operators)

In addition to the discussions, the Board's staff conducted an on-site field inspection of
the gravel operations on September 26, 2001. Individuals participants of the field
inspection are listed in Exhibit 1 (see Appendix). '

In addition, the CWCB has received a significant number of written correspondence
items related to the gravel mining from concern citizens, which are located in the Dolores
River Valley. A compilation ofllie information is presented in Attachment 1.

Technical Review Request
In response to the technical request, CWCB is performing a review of the existing
d,esignated and approved floodplain information and making a hydrologic and hydraulic
assessment of the existing data as it pertains to the individual gravel sites (1,2&3). The
eWCB has not received a detailed boundary survey map for the sites under review,
however the site locations have been identified on available mapping provided by
Montezuma County and on existing aerial photography.