Skunk Creek Letter of Map Revision (LOMR) - Home

We appreciate your interest in the Skunk Creek Letter of Map Revision (LOMR) Project. This Web site contains information about the floodplain model, the project team and the opportunities for public involvement.

• Public Involvement/Meetings
• Flood insurance information
• Project Team
• Contact Us

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Introduction:

The City of Boulder has developed a floodplain model for Skunk Creek (SC) that will potentially update and replace both the Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Map (FIRM) and the City of Boulder floodplain map. This new model will simplify the floodplain management of SC by providing one regulatory floodplain map for both the city and federal governments. The proposed mapping revision also incorporates more accurate topographic information and improvements along SC that have occurred since the effective floodplain map was approved by FEMA in 1987.

New floodplain maps are being developed based on:

• Updated and more accurate topographic data;

• City sponsored improvements at the Broadway and 27^th Way Pedestrian Underpasses; and

• Updated floodplain, floodway and high hazard zone boundaries.

Based on this new information, some structures will be removed from the high hazard zone, while others will now be included.

Background:

Floodplain mapping studies provide the basis for flood management by identifying the areas subject to flooding. This information is essential in determining areas where life safety is threatened and damage to property is likely. Floodplain maps need to be updated periodically to reflect changes in the floodplain resulting from land development, flood mitigation improvements, new study technologies and the impacts of major floods that may have occurred.

The Skunk Creek Flood Mapping Study (SC FMS) will update the Skunk Creek Floodplain map. The existing FEMA FIRM is based on a detailed, though dated, study with incorporates floodplain boundaries, water surface elevations and a conveyance zone downstream of King Avenue and an approximate floodplain delineation that only shows floodplain boundaries upstream of King Avenue. The existing City of Boulder floodplain map is a detailed, though dated, delineation of the floodplain that includes floodplain boundaries, water surface elevations, conveyance zones and high hazard zones. The new study will establish floodplain boundaries, water surface elevations, conveyance zones and high hazard zones using current methodology and will include improvements and changes along SC that have occurred since the current maps were approved by FEMA in 1987.

Floodplain Study Overview:

The SC FMS evaluates the floodplain from the area downstream of the new Anderson Ditch in the Green Mountain Cemetery to downstream of 27^th Way, which is approximately 0.5 miles of stream. The floodplain mapping study and floodplain work maps of the project area are included below:

• Skunk Creek Letter of Map Revision Study
• Skunk Creek Workmaps

Study Results - Impacts to Structures:

Based on updated and more accurate topographical data, land use changes since 1987 and City sponsored improvements at the Broadway and 27^th Way Pedestrian Underpasses, floodway and high hazard zone boundaries have been updated and changed from the existing floodplain maps. Based on these changes, some structures have been removed from the floodplain, floodway and high hazard zones while others have been identified that now place them in these areas. The graphics below indicated the changes in floodplain designation that have occurred for all structures in the old and new floodplain. These exhibits depict the changes as they relate to changes in floodplain, conveyance zone and high hazard zones.

Please note that the graphics and associated address tables may not be completely comprehensive due to data limitations. Enhancements and modification to the list will continue to be made as the floodplain adoption process moves forward.

• Public information for structure floodplain status address mapping and tables

• 100-YEAR Effective FEMA vs. Proposed Floodplain Property Data
• 100-YEAR Effective City vs. Proposed Floodplain Property Data
• 500-year Floodplain Property Data
• Floodway Property Data
• City High-Hazard Property Data

27^th Way to Broadway

• FEMA vs. Proposed 100-Year Floodplain Downstream of 27th Way to Broadway
• City vs Proposed 100-year Floodplain Downstream of 27th Way to Broadway

• FEMA vs. Proposed Conveyance Floodplain Downstream of 27th Way to Broadway
• Effective City vs. Proposed Conveyance Floodplain Downstream of 27th Way to Broadway
• 500-year floodplain - 27th Way to Broadway
• City vs. Proposed High Hazard Floodplain Downstream of 27th Way to Broadway

Broadway to Green Mountain Cemetery

• FEMA vs. Proposed 100-Year Floodplain Broadway to Green Mountain Cemetery
• City vs. Proposed 100-Year Floodplain Broadway to Green Mountain Cemetery

• FEMA vs. Proposed Conveyance Floodplain Broadway to Green Mountain Cemetery
• Effective City vs. Proposed Conveyance Floodplain Broadway to Green Mountain Cemetery

• City vs. Proposed High Hazard Floodplain Broadway to Green Mountain Cemetery
  
• 500-year Floodplain - Broadway to Green Mountain Cemetery

Property specific information on the land development requirements for all floodplain zones can be found by contacting the Planning and Development Services workgroup at 303-441-1880 or This e-mail address is being protected from spambots. You need JavaScript enabled to view it . A general land development facts sheet is provided below for general reference.

• Land Development Handout

Last Updated on Thursday, 05 November 2009 13:41