How could the modification of the Lake Hodges Dam affect Rancho Santa Fe?
Reduced dam capacity may increase flood risk for Rancho Santa Fe during wet years The City of San Diego plans to permanently cut the spillway of Lake Hodges Dam down to 280 feet. This modification reduces the reservoir's capacity, meaning that during above-average years or El Niño events, the lake is more likely to overflow. According to reports, when the lake exceeds this 280-foot limit, the water flows through communities including Rancho Santa Fe, potentially causing flooding.
- Effect
- Strong negative
- How direct
- 2 steps, all reported
- When
- Within weeks
- The story
- No new developments lately
How it reaches Rancho Santa Fe
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The City of San Diego announced a change to its plans for Hodges Dam at Lake Hodges. Instead of beginning a new dam as originally planned, the city will cut the existing dam’s spillway down to 280 feet permanently. This modification, which is called “interim risk reduction,” will cost $50 million and take seven years to complete, starting in 2030. The permanent cut means the lake can never rise above the state’s limit.
The full event1independent outlet -
The City of San Diego plans to cut the old dam’s spillway down to 280 feet permanently. This action removes the top third of the reservoir, severely limiting the lake’s capacity to hold water.
1 report connects these two. Brind only summarizes; follow a link to read the reporting itself.
- sandiegouniontribune.com Tuesday
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dam in San Diego County, California, United States of America
Everything about Hodges Dam -
With the reduced capacity, the lake has only room for about one storm after being drained into the 260-foot range each fall. After that, everything goes over the dam in every above-average year and every El Niño, flowing through Rancho Santa Fe.
1 report connects these two. Brind only summarizes; follow a link to read the reporting itself.
- sandiegouniontribune.com Tuesday
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census-designated place in San Diego County, California, United States
Everything about Rancho Santa Fe
Tap any step to see the evidence behind it.
The facts so far
As reported. Each one links to where it comes from.
- The city plans to cut the old dam’s spillway down to 280 feet permanently.sandiegouniontribune.com
- The lake has spilled only a handful of times in 45 years because it had room for a wet winter.sandiegouniontribune.com
- At a 280-foot spillway, there is room for about one storm after the lake is drained into the 260-foot range each fall.sandiegouniontribune.com
- Overflow during wet periods flows through Rancho Santa Fe and into the Del Mar Fairgrounds.sandiegouniontribune.com
Why it matters
The Lake Hodges reservoir is a critical feature for water management and flood control for downstream communities like Rancho Santa Fe. The city is currently weighing the risk of catastrophic wildfire in the drained valley against the near-certain risk of increased flooding if the dam is cut to 280 feet.
This decision is part of a larger debate over how to manage the reservoir, which has been held at 280 feet for five years due to earthquake fears. Advocates argue that restoring the lake's capacity to a higher level, such as 295 feet, would mitigate both wildfire and flood risks.
What we don't know yet
- How often will the lake spill at 280 feet with one valve and flood the communities downstream?
- What is the city's written date for breaking ground on a new dam?
What would change this answer
Who else could feel it
Other possible ripples from the same event.
Reporting
- sandiegouniontribune.comTuesday
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