Despite the Arroyo Seco's dry name and the semiarid climate of the region, periodically torrential floods from the steep, erosion-prone mountain watershed of the Arroyo Seco would race through the communities of this region all the way to Los Angeles. The reputation of Arroyo Seco floods led the early settlers of Los Angeles to situate their pueblo on a bluff out of the way of the confluence of the Arroyo Seco and the Los Angeles River. As population multiplied in the region, the damage from these floods was particularly severe in 1914 and 1916.
In 1920 flood engineers from the Los Angeles County Flood Control District built Devil's Gate Dam in the Arroyo Seco, the first flood control dam in Los Angeles County. Named for a rock outcropping which resembles the face of a devil, Devil's Gate gorge, located in Pasadena between La Cañada Flintridge and Altadena, is the narrowest spot in the Arroyo Seco.
Above the dam is the flood basin which captures the flows of the mountain watershed of the Arroyo Seco. This area is now called "Hahamongna," a phrase meaning "Flowing Waters, Fruitful Valley," a remarkably different designation than the name given the area by the Spanish explorers. Hahamongna also refers to the original Native American tribe of the Tongva Indians who once inhabited the area. Pasadena is developing the Devil's Gate/Hahamongna flood basin into Hahamongna Watershed Park, a 1,400-acre (6 km²) regional park, which emphasizes the unique natural values of the park
Arroyo Seco, infos taken from
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