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United States
California
Sonoma County
Santa Rosa

Lake Ilsanjo – Warren Richardson Trail loop from Hwy 12 & Oakmont Dr

Routes
Hiking trails & Routes
United States
California
Sonoma County
Santa Rosa

Lake Ilsanjo – Warren Richardson Trail loop from Hwy 12 & Oakmont Dr

Moderate

4.5

(6130)

11,548

hikers

Lake Ilsanjo – Warren Richardson Trail loop from Hwy 12 & Oakmont Dr

03:38

13.1km

230m

Hiking

Moderate hike. Good fitness required. Easily walkable paths. The starting point of the route is accessible with public transport.

Last updated: October 8, 2026

Waypoints

A

Start point

Bus stop

Get Directions
1

6.34 km

Lake Ilsanjo

Highlight • Lake

Lake Ilsanjo is a small quiet lake near the top of Canyon trail. A hidden gem for a break or a swim. It is much quieter than Santa Rosa Reservoir …

Tip by

2

6.56 km

Lake Ilsanjo

Highlight • Lake

Very pretty lake in the middle of Annadel State Park, great for a swim on a hot day. Access is best from Lake Trail with a small beach on the north-west side.

Tip by

3

7.75 km

Warren Richardson Trail

Highlight (Segment) • Trail

The Warren Richardson Trail is a gravel and dirt path that begins at the main entrance on the eastern side of the park. It ascends to the summit of the …

Tip by

4

8.00 km

Get off the wide forest road onto the quieter hiking trails

Tip by

B

13.1 km

End point

Bus stop

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Way Types & Surfaces

Way Types

4.29 km

4.25 km

2.52 km

1.82 km

216 m

Surfaces

4.34 km

3.99 km

1.45 km

1.26 km

1.26 km

780 m

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Elevation

Elevation
Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (290 m)

Lowest point (110 m)

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Weather

Powered by Foreca

Monday 2 November

18°C

8°C

0 %

Additional weather tips

Max wind speed: 2.0 km/h

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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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