The world’s largest wildlife crossing over the 101 Freeway in Agoura Hills is set to be completed by December 2. The key hurdle remains the weather, particularly potential winter storms.
A concrete bridge now spans 10 lanes of the busy freeway. It supports a lush landscape with 6,000 native plants. Crews have also finished an overpass connecting Agoura Road. The major task left is filling the gap between the freeway, the road, and the northern land with millions of cubic feet of soil. This ensures a seamless animal pathway.
The aim of the Wallis Annenberg Wildlife Crossing is to aid mountain lions in the Santa Monica Mountains. These lions are isolated by traffic and suffer from inbreeding.
Beth Pratt, president of the Wildlife Crossing Fund, is optimistic but worried about El Niño conditions that could bring heavy rain. Flooding could halt work, posing safety risks. The area’s clay and silt soil becomes slick when wet, complicating construction efforts as explained by Robert Rock, the lead landscape architect. This soil requires proper compaction, which becomes difficult in wet conditions.
Previously, during the heavy rains in winter 2022-23, construction faced delays. Water collected in trenches, impeding soil compaction. It pushed back the original completion date from late 2025. Critics have attacked the project over costs, now at $114 million, and delays. Some have labeled it as a wasteful endeavor, likening it to the prolonged high-speed rail project in the state.
Despite this, a completion date is now set. However, Pratt has faced aggression on social media, affecting her willingness to share project updates. Nevertheless, the project’s success holds significant importance for Santa Monica’s mountain lions, whose population is threatened. Since 2002, around 41% of matings have involved close relatives.
Recent studies reveal inbreeding deformities, such as a kinked tail, in a young male lion. If reproductive rates drop, extinction becomes likely within 50 years according to models. The crossing will enable lions to find new mates in the Simi Hills and beyond, increasing genetic diversity.
Trail cameras have caught glimpses of wildlife, including coyotes, deer, and mountain lions, proving the crossing’s potential. A female lion with cubs has been spotted near the construction area, signaling hope for the future. In the Simi Hills, new lion kittens are being tracked, potentially becoming early users of the crossing.
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