But because factories were allowed to -- allowing warm water to run back into the river, the temperature was becoming too high for the salmon to survive.
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Light winds and the traditional difficult run to the finish on the Derwent River left the outcome in doubt to the very end, even before the protest.
Indiscriminate logging and deforestation have caused the exposed soil to run off into the river, silting it up and reducing its water-flow capacity.
Special arrangements can be made to take the North Borneo Railway further afield, as far as Beaufort and even on the spectacular run over the Padas River to Tenom.
Run-of-the-river dams like Baglihar consume nothing, since water must flow to run turbines.
Instead of building a great wall across the Xingu to create a massive reservoir, Belo Monte is designed as a run-of-river dam, a technique that harnesses the natural flow of the river to drive the turbines.
Sadly there is no easy way to string together a long, continuous river run.
Even the rivers of the Kola peninsula, so heavily promoted by American and British travel companies, now seem under threat, with biologists estimating that poachers kill up to 50% of the salmon run on the Kola River and as much as a third on the Umba, Kharlovka and Rynda.
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Currently run by Severn River Crossing Plc, the bridge will return to public ownership when the firm has collected a fixed sum of money from tolls, expected to be around 2017.
Egypt's Deputy Foreign Minister for African Affairs, Ali Hifni, said that the diversion of the river was not something to worry about, according to the Egyptian state-run news agency Mena.
The company, however, continued to run crude beneath the Yellowstone after finding that a section of pipeline leading away from the river was still buried more than 6 feet deep.
For junior hydroelectric companies, these run-of-river projects are a less expensive, more efficient, and fish-friendlier way to get in on the energy game.
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