Arthur Morgan Built a Government Before He Built a Dam

In February 1914, Ohio Governor James Cox signed the Conservancy Act into law, a piece of legislation with no American precedent, designed to let an engineer reorganize five counties around a river.¹

The engineer was Arthur Ernest Morgan, a self-educated Minnesotan who had been building levees and drainage systems across the country since his twenties. Nine months earlier, Dayton's Flood Prevention Committee had hired him to design a system that would prevent a repeat of the Great Flood of March 1913, which killed at least 360 people and submerged downtown Dayton under seventeen feet of water.²

By October 1913, Morgan had delivered his report. His conclusion was blunt: widening the river channel wouldn't work. The Great Miami River watershed needed five earthen dams, channel improvements, and preserved floodplains, all operated as a single system across county and municipal lines. Ohio law didn't permit that. So before Morgan could move a shovelful of dirt, he needed a new kind of government.³

What follows is a reconstructed conversation drawn from Morgan's documented engineering positions, his 1951 account of the project, period journalism, and the institutional record of the Miami Conservancy District. Morgan himself, having died in 1975 at the age of 97, was regrettably unavailable. His positions, however, were not. He documented them with a thoroughness that borders on the compulsive. We've placed the conversation in early 1914, the weeks after the Act's passage, when Morgan's engineering conclusions were complete but construction remained years away and the political resistance was sharpest.

You've just spent months convincing Ohio to pass a law that lets you build across five counties. Dayton flooded. Why isn't this Dayton's problem to fix?

Morgan: Because the river doesn't know where Dayton is. The Great Miami rises to rain like a trout to a fly; the whole watershed responds at once.⁴ If Dayton builds walls and Dayton alone, it changes the hydraulics for every community upstream and downstream. You cannot engineer a reach of river without engineering the river. That's arithmetic, not opinion.

But the people upstream didn't flood. Troy didn't lose seventeen feet of downtown.

Morgan: Troy will tell you the Conservancy Act brings ruin, death, and starvation to Miami County. One of their newspapers said exactly that.⁵ I understand the sentiment. We're asking communities that experienced the flood differently to participate in a single system. Some of them will host dams. Some will see their farmland used as temporary storage during high water. They're absorbing costs for a problem they experience as Dayton's.

But the watershed is the watershed. If we let each municipality protect itself, they'll build competing structures that move the problem. Dayton raises its levees, the water backs up into someone else's bottomland. That someone builds their own wall, and the pressure shifts again. You end up in an arms race against your own neighbors, and the river wins every round.

You've recommended dry dams. Dams with no water behind them. There's no precedent for this in America. Why should anyone trust it?

Morgan: There's no precedent for a lot of what we're proposing. I'd rather be judged on whether the engineering is sound than on whether someone's done it before.

The Great Miami's problem is variability. The river can go from normal flow to catastrophic in hours. A permanent reservoir stores water all the time. You're paying for storage you don't need 364 days a year, and you've drowned productive farmland permanently. A dry dam has conduits at its base. Normal flow passes through unimpeded. When the river rises past the conduit capacity, water stores behind the dam temporarily, days, maybe a few weeks, and then drains.⁶ The land behind the dam is farmable in ordinary years. You're borrowing the land during emergencies, not taking it.

And this offends people.

I can't help that. Every alternative has been studied. Channel widening alone cannot handle the flows. Permanent reservoirs destroy more land than they protect. The dry dam design handles the variability of this specific river in this specific valley. I would rather build something that works and looks strange than something that looks familiar and fails.

How do you know what flows to design for? The 1913 flood could have been a once-in-a-century event.

Morgan: We sent an engineer to a castle on the Danube where high-water marks have been recorded for nine centuries. The great flood of 1066 was only twenty-five percent larger than their hundred-year flood.⁸ Nine hundred years of data, and the upper bound was remarkably stable. I've designed for flows forty percent above 1913. If I'm wrong, I'm wrong on the generous side.

We also gathered half a million data points on the 160 greatest storms in American history and plotted detailed maps for each one.⁹ I wanted to understand what this watershed could actually produce, not what it happened to produce last March.

Who pays for all of this?

Morgan: Every property that benefits from the system pays an assessment proportional to the benefit it receives. Properties closer to the floodplain pay more. Properties further away pay less. The Conservancy Court, judges from each county in the district, confirms the appraisers' findings and authorizes the assessments.¹⁰ No single city controls the process.

And if property values change? If the county grows?

Morgan: The law provides for periodic readjustment. Benefits are reassessed as conditions change.¹¹

What happens in forty years, when no one alive remembers the flood?

Morgan: That is the problem I cannot engineer around.

The public clamor right now is to make the dirt fly, to build something visible and declare victory.¹² I understand the impulse. But what we're building is not a project. It's an obligation. These dams will require inspection, maintenance, and repair for as long as people live in this valley. The assessments must continue. The floodplains must remain clear. Build on them, and you force water to flow faster and deeper, and the system fails.¹³

You live in Englewood. One of the proposed dam sites is near your home.

Morgan: Yes.

Your son Ernest says the neighborhood boys taunt him about it.

Morgan: I'm aware of what the neighborhood boys say.¹⁴

Does it give you pause?

Morgan: It gives me confidence that the opposition is personal, not technical. No one has produced an engineering argument against the plan that survives examination. They've produced fear, which I respect, and resentment, which I understand. But I've studied every alternative. They've all been ruled out. What remains is what works.

The Conservancy Court organized the Miami Conservancy District on June 28, 1915, by a vote of 5 to 4. Sixty-one legal challenges followed, reaching the U.S. Supreme Court, which upheld the law. Construction began January 27, 1918, and finished in 1922, a year ahead of schedule, at a cost of roughly $30.85 million (about $649 million in today's dollars).¹⁵

The system has stored floodwater more than 2,100 times since completion. No major flood has struck the protected communities.

Morgan's forty-year question arrived on schedule. The Dam Safety Initiative, a capital assessment funding critical repairs, expired in 2022. Assessment revenues have remained mostly flat since 2012. Average precipitation across the watershed has steadily increased, meaning the dams and levees face more frequent saturation and erosive pressure than Morgan's team designed for. The infrastructure is now over a century old.¹⁶

The five dry dams still have no water behind them. The 35,650 acres of storage land upstream are still farmed and used as parkland. The conduits at the base of each dam still let the Great Miami pass through, unbothered, on ordinary days.

The question of who pays, and whether they remember why, remains unengineered.

Footnotes

1. Miami Conservancy District, "The Conservancy Act." https://www.mcdwater.org/about-mcd/history-the-conservancy-act. MCD's own timeline dates the signing to February 7, 1914; other sources give March 17, 1914. ↩

2. Miami Conservancy District, "History." https://www.mcdwater.org/about-mcd/the-history-of-mcd. Death toll varies by source: MCD says 360; ASCE's historic landmark designation says "more than 400." ↩

3. Miami Conservancy District, "History — Construction." https://www.mcdwater.org/about-mcd/history-construction ↩

4. Mark Bernstein, "Arthur Morgan — A Mover of Earth, A Pourer of Concrete, a Shaper of Minds," Ohio Magazine, February 1987, reprinted at Dayton Innovation Legacy. https://www.daytoninnovationlegacy.org/morgan.html. This phrase appears to originate in Morgan's 1951 account, The Miami Conservancy District (McGraw-Hill). ↩

5. Bernstein, Ohio Magazine, 1987. The specific Troy newspaper is not named in available sources. ↩

6. Miami Conservancy District, "Dry Dams." https://www.mcdwater.org/flood-protection/dry-dams ↩

7. Morgan's own characterization of the opposition, from The Miami Conservancy District (1951), as quoted in Bernstein 1987. ↩

8. Bernstein, Ohio Magazine, 1987, drawing on Morgan's 1951 account. ↩

9. Bernstein, Ohio Magazine, 1987. ↩

10. Miami Conservancy District, "Governance (O.R.C. 6101)." https://www.mcdwater.org/about-mcd/mcd-governance ↩

11. Miami Conservancy District, "Funding." https://www.mcdwater.org/funding ↩

12. Bernstein, Ohio Magazine, 1987 — Morgan's documented warning to the Flood Prevention Committee. ↩

13. Miami Conservancy District, "Integrated Flood Protection System." https://www.mcdwater.org/about-mcd/history-construction ↩

14. Ernest Morgan's recollection, as reported in Bernstein 1987. Morgan's private response is not documented; we have not invented one. ↩

15. Miami Conservancy District, "MCD Timeline." https://mcdwater.org/timeline; ASCE, "Miami Conservancy District Historic Landmark." https://www.asce.org/about-civil-engineering/history-and-heritage/historic-landmarks/miami-conservancy-district ↩

16. Miami Conservancy District, "Capital Improvement Projects." https://www.mcdwater.org/flood-protection/capital-projects ↩