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South Marsh Loop

Elkhorn Slough National Estuarine Research Reserve

Gabilan + Southern Diablo Mountains, California

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South Marsh Loop

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  • Visitor's center at Elkhorn Slough National Estuarine Research Reserve.- South Marsh Loop
  • Picnic area near the visitor's center.- South Marsh Loop
  • Elkhorn Slough National Estuarine Research Reserve viewing platform.- South Marsh Loop
  • Elkhorn Slough National Estuarine Research Reserve viewing platform.- South Marsh Loop
  • Picnic tables are interspersed throughout Elkhorn Slough National Estuarine Research Reserve.- South Marsh Loop
  • Clearly marked trails in Elkhorn Slough National Estuarine Research Reserve.- South Marsh Loop
  • Remnants of an old dairy farm.- South Marsh Loop
  • Trail along the South Marsh Loop.- South Marsh Loop
  • Boardwalk leading out into the slough.- South Marsh Loop
  • Bridge crossing.- South Marsh Loop
  • View near the North Marsh Loop Trailhead.- South Marsh Loop
  • A pelican prepares for landing at Elkhorn Slough National Estuarine Research Reserve.- South Marsh Loop
  • A mudflat in the slough.- South Marsh Loop
  • The way to Hummingbird Island.- South Marsh Loop
  • South end of the slough.- South Marsh Loop
  • An otter passing by.- South Marsh Loop
  • An egret flying overhead.- South Marsh Loop
  • Railroad crossing to Hummingbird Island.- South Marsh Loop
  • View from Hummingbird Island.- South Marsh Loop
  • North Slough Overlook.- South Marsh Loop
  • Viewpoint at North Slough Overlook.- South Marsh Loop
  • Mudflats covered with birds.- South Marsh Loop
  • A great egret looking for a meal.- South Marsh Loop
  • An endangered brown pelican.- South Marsh Loop
  • East side of the South Marsh Loop.- South Marsh Loop
  • Elkhorn Slough National Estuarine Research Reserve.- South Marsh Loop
  • Barn at the dairy farm.- South Marsh Loop
Overview + Weather
Pros: 
Great chance to get close to wildlife.
Cons: 
No water at trailhead.
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Region:
Gabilan + Southern Diablo Mountains, CA
Congestion: 
Moderate
Pets allowed: 
No
Net Elevation Gain: 
110.00 ft (33.53 m)
Parking Pass: 
General Day Use Fee
Preferable Season(s):
Spring, Fall
Total Distance: 
2.20 mi (3.54 km)
Trail type: 
Loop
Trailhead Elevation: 
10.00 ft (3.05 m)
Current Local Weather:
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Hike Description

Hike Description

Contributor

Home to nearly 700 different species of animals, the Elkhorn Slough is an amazing place to catch a wide variety of wildlife in their natural habitat. Hiking the South Marsh Loop is a quick 2.2-mile journey through this diverse landscape, and it takes you along the shoreline for some close-up opportunities to see these animals in action. Bird watchers and photographers should definitely put this trail on their list.

South Marsh Loop is located inside the Elkhorn Slough National Estuarine Research Reserve. You are required to pay an entrance fee and brush your shoes before you hike any trails in the reserve. Sudden Oak Death is a plant borne disease that is prevalent in California and Oregon, and scrubbing your shoes helps stop the spread of this disease.

The trailhead starts from the visitor's center and cuts through an open meadow toward an old 1920s dairy farm. This farm is a nexus for the South Marsh as well as the Five Fingers and Upper Valley Loops. Heading left from the South Marsh trail marker, the path takes you down to the waterfront where you will find a boardwalk heading out into the water. This boardwalk and the nearby bridge are excellent spots for viewing, especially when the tide is out.

The next section of this trail has a few short and worthwhile detours. You have the option to head out to Hummingbird Island, a half-mile walk that takes you across the railroad tracks and near the main channel of the slough. You can also take the North Marsh Overlook Trail for some excellent view points. The rest of the hike follows the shoreline until it connects back to the dairy farm. From here, you can continue to explore the upper areas of the reserve by taking the Five Fingers Loop or return to the parking lot.

 

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(9 within a 30 mile radius)

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