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Fish Lake Dam
Fish Lake Dam

Statistics

General

  • Region (Map) : ................... Pacific Northwest
  • State (Map) ......................... Oregon
  • County ................................ Jackson
  • Project: ................................ Rogue River Basin
  • Dam type: ........................... Earthfill
  • Location: ............................ 35 mi NE of Medford
  • Watercourse: ..................... Little Butte Creek
  • Reservoir: ........................... Fish Lake
  • Construction Date:  .......... 1908
  • Rebuilt: ............................... 1922-1923
  • National ID Number ......... OR00021
  • Hydrologic Unit Code .....

Dimensions

Hydraulics

  • Normal Water Surface Elev: ............... 4641.5 ft
  • Hydraulic Height: .................................... 28.0 ft
  • Service Spillway Type:
  •    Uncontrolled  Crest    ................................Yes
  •    Morning-Glory ............................................ No
  •    Crest Length    ....................................... 75.0 ft
  •    Gated      ....................................................... No
  •    Capacity at Elev:  4645.0 ft,.............. 1,700 cfs 
  • Auxiliary Spillway ........................................ Yes
  •     Capacity at Elev. 4644.8 ft  ............. 5,600 cfs
  • Outlet Works Capacity at
  •     Elevation  4645 ft.,............................... 475 cfs

Hydrology

  • Drainage Area: ................................. sq mi
  • Hydrometeorological Report      HMR x
  • Flood Type: ...............................General
  • Storm Duration: .......................................  hrs
  • Probable Maximum Flood (PMF) Report:
  •   Peak Inflow: ..................................  cfs
  •   Inflow Volume: ........................  acre-ft
  •   Flow Duration: ......................................0 days
  •   PMF Routing MWS Elev.: ................. x.0 ft
  •   Initial Routing Elev: ............................ x.0 ft
  •   Study Date:

Power Generation

Narration

 

Geology

Fish Lake Dam and reservoir are located within the high cascades physiographic province near the crest of the mountain range.  Upstream of the dam the North Fork Little Butte drainage basin flows west from the crest of the Cascades and is defined by Mt. McLaughin to the north of the reservoir and Brown Mountain, a small shield volcano located to the southeast of Fish Lake.  The left abutment of Fish Lake Dam consists of blocky, andesite lava flow erupted from Brown Mountain (Qbm) subsequent to the retreat of the Pleistocene glaciers.  The andesite is dark gray with fine grained ground mass and scattered vesicles.  The lack of notable phenocrysts within the ground mass distinguishes the Brown Mountain andesite from the underlying Fish Lake lavas (Qfi).  The Brown Mountain andesite is divided into dense central unit of the flow and the upper and lower breccia.  The central zone is fresh to slightly weathered, intensely to slightly fractured, hard and dense.  The breccia (Qbmb) is an intensely to moderately weathered, moderately hard to soft, vesicular andesite that is moderately to intensely fractured.

Links

 | Recreation | (NA)

 | Dams Located by State | USBR Oregon Dams | Pacific Northwest Region Dams |

 | Owner:  Medford Irrigation District,
                       1340 Myers Lane, Medford, OR  97501-1270, (541) 779-1462

 | Operator:  Medford Irrigation District,
                       1340 Myers Lane, Medford, OR  97501-1270, (541) 779-1462

 
 

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