Mathews Canyon Dam

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Mathews Canyon Dam

Project Data Report

Background

Physical Data

MATHEWS CANYON DAM AND RESERVOIR
LINCOLN COUNTY, NEVADA
PERTINENT DATA - June 2016
Project Purpose   Local Flood Protection  
Completion Date   December 1957  
Stream System    Clover Creek, Meadow Valley Wash, lower Muddy River Basin, Colorado River
Drainage Area     34 mi2  
Significant Upstream Flood Control Facilities   None  
DSAC Rating   4
Reservoir:
Elevation  NGVD 1929 +4.41 ft =  NAVD 1988
  Streambed at dam - Outlet Apron   5,420.0 ft 5,424.4
  Spillway crest   5,461.0 ft 5,465.4
  Revised PMF Spillway Surcharge Level2   5,481.7 ft 5,486.1
  Top of dam   5,483.0 ft 5,487.4
Area1      
  Spillway crest 298 acres  
  Revised PMF Spillway Surcharge Level2   444 acres  
  Top of dam   451 acres  
Capacity1, Gross      
  Spillway crest (includes sediment allowance)   6,270.7 af  
  Revised PMF Spillway Surcharge Level   13,945 af  
  Top of dam   14,576.5 af  
  Allowance for sediment (50-year)   1,000 af  
Dam Type: Earthfill    
  Height above streambed   63 ft  
  Crest length   800 ft  
  Crest width   20 ft  
  Revised PMF Spillway Surcharge Freeboard2   1.3 ft  
Spillway Type: Concrete Ogee Weir
  Crest Length   50 ft  
  Revised PMF Spillway Surcharge2   20.7 ft  
Outlet Conduit Type: Ungated
    Number and size   1 - 3.5 dia ft  
    Conduit Invert Elevation   5,420.0 ft 5424.4
    Length   368 ft  
    Maximum capacity at spillway crest   260 cfs  
Reservoir Design Flood        
    Duration (inflow)   2 days  
    Maximum water surface elevation   5,460.6 ft 5,465.0
    Total volume   5,800 af  
    Inflow, peak   8,500 cfs  
    Outflow, peak   259 cfs  
Spillway Design Flood ➜        
  Duration (Inflow)   1 days 1.25
  Total volume   5478.1 (5,482.5 NAVD) ft 5,688.5 (5,486.1 NAVD)
  Maximum water surface elevation   13,400 af 18,000
  Inflow peak   35,000 cfs 68,100
  Outflow peak   13,060 cfs 49,200
Historic Maximums   Date: 1/11/2005    
    Maximum water surface elevation   5,454.3 ft 5,458.7
    Maximum storage (70% Full)   4,405.6 af  
    Maximum 1-hr inflow   2,129 cfs  
    Maximum 1-hr outflow   238 cfs  
         
 
Reference: Design Memorandum No. 2: General Design for Mathews Canyon Dam, June 1955
1. Based on Original & Only 1954 Survey
2. Interim Report on Hydrology and Hydraulic Review of Design Features of Existing Dams for Pine Canyon and Mathews Canyon Dams, July 1978
 
 

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