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Grand Lake Today / History

The making of the lake

Pensacola Dam & the making of Grand Lake

A Depression-era building project changed the Grand River Valley—and created the lake at the center of our lives today.

A vision before there was a lake

Long before vacation docks lined these shores, Cherokee tribal member Henry Holderman was promoting a dam on the Grand River. His campaign helped set the stage for the Grand River Dam Authority, created by Oklahoma’s legislature in 1935 to develop waterpower and manage the river. [1]

GRDA hired Tulsa engineer W. R. Holway as its chief engineer. Federal funding followed in 1937, including a Public Works Administration loan and grant. This was a major public-works undertaking, not simply a lake dug for recreation. [1]

1938–1940: building across the valley

GRDA’s anniversary history records preparatory dirt work under way in September 1938. Its dam profile gives the construction interval as December 30, 1938, through March 21, 1940. Thousands came to the area for work during the Great Depression. [2][3]

The dam stands between Langley and Disney. Its 51 arches are the signature feature of a structure that GRDA describes as spanning a mile across the Grand River Valley. Securing enough of the right cement for the fast construction schedule required coordination among suppliers in several states. [3][5]

Summer 1940: a new shoreline

Completing the dam and filling the lake were not one instant. GRDA describes the waters of the Grand River steadily filling the new reservoir through summer 1940. By late summer, Grand Lake had become a reality. The same account notes that roadway work was still in progress in a photograph from that summer. [4]

The lake changed more than the view. Families and communities had to make way for the water. Old Bernice moved; Ketchum’s first site went underwater after a much earlier move for the railroad. Those are related, but different, stories. Read Before the water →

Power, engineering and a lasting landmark

Pensacola was the first hydroelectric facility built in Oklahoma. Its generators began the tradition of turning falling water into electricity that GRDA celebrated at the dam’s eightieth anniversary in 2020. The dam was listed on the National Register of Historic Places in 2003. [3][2][4]

Sources & further reading

Checked November 10, 2026. Historical summaries are written in our own words; source photographs are not reused unless specifically credited.

  1. Glen Roberson, “Grand River Dam Authority,” Oklahoma Historical SocietyHenry Holderman, the 1935 enabling legislation, W. R. Holway and the broader project history.
  2. GRDA, “Celebrating 80 in 2020”Preparatory earthwork in September 1938 and the dam’s 1940 power-production milestone.
  3. GRDA, “Pensacola Dam”GRDA’s stated construction dates, location and first-hydroelectric-facility description.
  4. GRDA, “This Is Man’s Deed,” Power for Progress, September 2019Lake filling through summer 1940; lead engineer W. R. Holway; National Register listing in 2003.
  5. GRDA, “Finding the right mix to build Pensacola Dam”The dam’s 51 arches and the material-supply challenge.
  6. Shelby L. Hunter and Laura G. Labriola, USGS Scientific Investigations Report 2019–5040Cover photograph credited to Kevin Smith, U.S. Geological Survey. The report identifies copyrighted exceptions; none is marked for this USGS-credited photograph.