Lewis MacAdams
Riverfront Park
2944 Gleneden St,
Los Angeles, CA 90039


Established:
2001
Size:
42 acres
Features:
Walking Trails
Rare micro habitats
Nature center with cool exhibits
Rare and hard to care for plants
Fairy Shrimp!
Notable Plants:
Mariposa lily (Calochortus catalinae)
Bush lupin (Lupinus albifrons var. albifrons)
Chaparral mallow (Malacothamnus fasciculatus)
Fremontedendron (Fremontodendron californicum)
Santa Cruz Island ironwood (Lyonothamnus floribundus ssp. asplenifolius)
Mock heather (Ericameria ericoides)
Long stem buckwheat (Eriogonum elongatum)
Giant coreopsis (Leptosyne gigantea)
Best time to visit:
Winter, spring and early summer
The preserve at its finest when it is filled with water and migratory birds. Early summer brings out new blooms and slightly drier conditions which makes touring the preserve easier. The demonstration gardens are always amazing.
In 1986 Lewis Macadams cut a human sized hole in the chain link fence that separated the city from its river and declared it open. This act of civil disobedience started decades of activism and has resulted in the river we can see today. Lewis Macadams Park stands as a lasting tribute to this labor, toil, and love.
Lewis MacAdams Riverfront park is so beautiful. It is a stunning example of a small multi use park.The design serves both the environmental needs of the space and the needs of the community. The park features large grassy areas, a walking path with public exercise equipment and picnic tables. There is a large spanish revival style pavilion, which was designed by ERW Design. It can hold up to 200 people, and has both covered areas and a courtyard. The space is open for reservations- I have been to a really banger of a birthday party here- and a quick google search shows that the space has hosted a variety of events, including weddings.
The areas around this lovely infrastructure are some of the best parts of the park. This is where most of the bioswales are to be found. A small but dense woodland separates the edges of the park from the parking lot, making the space feel more intimate.
“…the landscape is not a performance for a viewer, but a larger, more complex system for which aesthetics is the least important aspect.”
The park is filled with fuchsias, sages, oaks, currants, ceanothus, manzanitas and so many more. What is truly lovely about Lewis MacAdams Park is that, as the plants have grown and matured, parts of the landscaping have become obscured. Small vistas have become visible only from one angle. This not only invites visitors to look and observe more closely but, more importantly, it is a reminder that maybe the land is not only for us. That the landscape is not a performance for a viewer, but a larger, more complex system for which aesthetics is the least important aspect.


While it has a parking lot complete with electric vehicle charging stations and a street entrance, the real entrance is from the river and the bike path, where it sits along the Glendale Narrows. At the river entrance there is a stone column with a carved frieze of Lewis MacAdams and verses of his poetry, as well as other information about his life and work.
This entrance changes the orientation of the park. Implying that, of course visitors would enter through here, they were already at the river.

“All Politics is local, and water politics are the foundation of all politics”. This famous quote of Lewis MacAdams’, comes from his time living in Bolinas, in Northern California. There, he witnessed two oil tankers crashing into each other and the community successfully keeping the oil out of the Bolinas lagoon and estuary. This incident had a profound effect on MacAdams and started laying the groundwork for a lifetime of activism and poetry.
Lewis MacAdams was a poet, activist, writer and artist. His work with the LA River, as is said every time MacAdams is mentioned, was a 40-year-long art piece. He was born in San Angelo, Texas in 1944 and came to LA by way of New York and the Bay Area. He would see the river from the bus stop as he traveled from the Downtown Arts District, where he lived, to Venice, where he worked. The river captivated him.
His first work with the river was the one-man show “Friends of the LA River” where he painted himself green, wore a white suit and embodied William Mulholland, and then embodied other river animals. This was not a success. The theater and his girlfriend at the time hated it (they broke up afterwards) and the LA Times wrote “with friends like MacAdams, the river needs no enemies.” Thankfully MacAdams continued.
A year later, with a few friends, bolt cutters spray painted silver and gold and with either caffeine or, as the FOLAR history says, “whiskey in their blood”, cut a human shaped hole in the fence that separated the river from the city and declared it open (The more common retelling of this story seems to omit the whiskey part. But really, is there anything more relatable than starting an activist movement one night while drunk with friends?).
They went to the water and asked the river if they could speak for it and, because of the sound of the machinery that was currently dredging the river, they could not hear a ‘no’, and took that as acceptance.
“The river is called a river. It can no longer be used as a sewage dump, the Glendale Narrows are no longer dredged, there are parks popping up all over the banks and, in 2015, 1.3 billion dollars was approved for habitat restoration.”
MacAdams started “Friends of the LA River” (the organization, not the theater show) and everything began to change. The river is called a river. It can no longer be used as a sewage dump, the Glendale Narrows are no longer dredged, there are parks popping up all over the banks and, in 2015, 1.3 billion dollars was approved for habitat restoration. As we know, this did not happen overnight. MacAdams said, “I thought all I had to do was convince people that the river could be better and I quickly realized that the first thing I had to do is to convince people that the river even existed.” But we are moving forward, and Lewis MacAdams riverfront park is a shining example of this progress.



More Information
Opening Hours:
Daily 7AM-6PM






















































![]](https://nativegardenmap.com/wp-content/uploads/2025/08/MMNC.42-1-1-1-1-1-1-1-1.jpg)



Madrona Marsh Preserve
and Nature Center
3201 Plaza del Amo,
Torrance, CA 90503


Established:
2001
Size:
42 acres
Features:
Walking Trails
Rare micro habitats
Nature center with cool exhibits
Rare and hard to care for plants
Fairy Shrimp!
Notable Plants:
Mariposa lily (Calochortus catalinae)
Bush lupin (Lupinus albifrons var. albifrons)
Chaparral mallow (Malacothamnus fasciculatus)
Fremontedendron (Fremontodendron californicum)
Santa Cruz Island ironwood (Lyonothamnus floribundus ssp. asplenifolius)
Mock heather (Ericameria ericoides)
Long stem buckwheat (Eriogonum elongatum)
Giant coreopsis (Leptosyne gigantea)
Best time to visit:
Winter, spring and early summer
Winter and early spring rains bring water back into the marsh. The preserve at its finest when it is filled with water and migratory birds. Early summer brings out new blooms and slightly drier conditions which makes touring the preserve easier. The demonstration gardens are always amazing.
The Madrona Marsh preserve and nature center sit on one of the few remnants of what was once a vast wetland system that stretched from Marina del Rey to Wilmington. Included in this area are the Ballona Wetlands and the Gardena Willows Preserve, which are also mentioned in this guide. Its 42 acres are home to a strange collection of micro habitats: vernal marshes, a seasonal marsh that in the dry season recedes into the aquifer, back dunes, these are dunes that are farther back from the water than the foredunes which are closer (great naming), coastal prairie and alkali margin, an area of higher salt content caused by fluctuations of water, and vernal pools.
The Nature Center , which is across the street from the Preserve, is surrounded by a half acre of beautiful mature demonstration gardens. They were started in 2001 by Tony Barker with the aim to promote more native gardens in the area.They are divided into habitat sections, back dune, coastal sage scrub, chaparral, riparian and desert. There are so many wonderful plants packed into this relatively small space making a visit a joyfully intense experience.
There are details everywhere. The large shrubs move gracefully to smaller, more delicate plants. There is always something to see and the garden is always changing. In Spring the bush lupins, mariposa lilies and coastal sunflowers are in bloom. Summer brings the fremontendrons, the buckwheats and mallows. The garden lets those plants that would go summer dormant, which adds a new intensity to space.
“The Nature Center , which is across the street from the Preserve, is surrounded by a half acre of beautiful mature demonstration gardens. They were started in 2001 by Tony Barker with the aim to promote more native gardens in the area.”
Little trails criss-cross through the garden and also define the now rather fuzzy borders of the different habitats. Despite its wild appearance the garden is meticulously cared for. I don’t think I have ever seen a weed and the garden hosts several species such as Ithuriel’s Spear and mariposa lilies which are specifically hard to care for.


The preserve is entered through a gate with a gate attendant. If you are wondering if this is because visitors have been locked in the preserve before (the whole section is fenced in), I asked, the answer is yes. There are several walking trails in the preserve, one that runs the whole perimeter and others the criss-cross through it. It is here that you will find all the interesting micro habitats. Madrona Marsh is considered to be one of, if not the only, remaining vernal marshes and is the largest preserve of coastal prairie and the last remaining vernal pools, in Los Angeles County. The vernal marsh is temporary, only existing in the wet season, and then slipping underneath the sand into the aquifer in the dry season.
The development of Torrance and changes to the site altered the water flow into the marsh and the vernal pools. To compensate for this, water is now pumped in during the rainy season mimicking what would be the natural water cycle of the site. The nine vernal pools are also undergoing restoration and maintenance. The pools and the surrounding areas are dredged, mostly by hand, to redirect and collect water. Invasive plants are removed and native plants, most of which are propagated on site, are reestablished around the areas of the pools.
Two types of fairy shrimp can be found here, both of which are federally endangered.
In addition, the preserve is home to or periodically hosts over 100 special status species. Special status is a blank term that is used to describe species that are sufficiently rare as to require protection and or consideration. They are listed as rare, threatened or endangered by the Federal and or state government.
“In addition, the preserve is home to or periodically hosts over 100 special status species. Special status is a blank term that is used to describe species that are sufficiently rare as to require protection and or consideration. They are listed as rare, threatened or endangered by the Federal and or state government.”
The site has a fascinating geological history as well. It was part of the historic route west of the Los Angeles river until the rise of the Palos Verdes peninsula routed the river south to Long Beach. This created a natural inland depression. The site is covered with fine sand that has been deposited through the aeolian process, which is the erosion, transportation and deposition of sediment by wind.
This complex mix of rare ecosystems has been awarded a SEA designation, which stands for Significant Ecological Area, and is awarded to locations of irreplaceable biological resources that support valuable and threatened species and promote species movement through habitat linkages and corridors.

As the City of Torrance grew in the 1950’s and 1960’s the city found itself losing large tracts of open space.The solution was to convert sites that were otherwise set aside for oil drilling. Madrona Marsh was one such area. It had been left open for drilling since 1920 but had never had more than one platform on the site and, therefore, was both undeveloped and relatively undisturbed.
While mostly ignored by the general public, the site had already been recognized as having an ecological value. It was a popular birding destination and had been used in botany and zoological courses over the years. In 1972, a meeting was held to create support for the creation of a preserve and wildlife park. Not long after this meeting the Friends of Madrona Marsh was formed and they became the driving force behind the creation of the preserve.
The group battled away for years. They paid for a “Wildlife Habitat Study” to be conducted and for plans to be drawn up for a preserve and visitors center. They led talks, held public meetings and began restoring the land. In 1980 the Torrance Investment Company, (a partnership of Watt Homes, Anderson Properties, Sherl Curci and Santa Fe Energy, the landowners) withdrew an offer to sell 15 acres of the land to the Friends of Madrona Marsh and began to actively try to develop the land.
In one memorable City Council meeting the Torrance Investment Company suggested that the marsh “be moved” (because that’s a thing) two and a half miles north to Columbia Park. The story of the Preserve is written as a joint effort between the Friends of the Madrona Marsh and the City, however it is important to note that the City Council was siding with developers at this point.
“In one memorable City Council meeting the Torrance Investment Company suggested that the marsh “be moved” (because that’s a thing) two and a half miles north to Columbia Park.”
The City did eventually side with the Marsh and in 1987 42 acres were preserved for the creation of the Nature Center and Marsh Preserve. The Nature Center was built in 1990. The Metropolitan Water District funded the demonstration gardens and the Preserve is run with funding from the Santa Monica Bay Restoration Project.



More Information
Opening Hours:
Tues. – Sat.
10AM-5PM






















































![]](https://nativegardenmap.com/wp-content/uploads/2025/08/MMNC.42-1-1-1-1-1-1-1-1.jpg)



Madrona Marsh Preserve and
Nature Center
3201 Plaza del Amo,
Torrance, CA 90503

Established:
2001
Size:
42 acres
Features:
Walking Trails
Rare micro habitats
Nature center
with cool exhibits
Rare and hard to
care for plants
Fairy Shrimp!
Notable Plants:
Mariposa lily (Calochortus catalinae)
Bush lupin (Lupinus albifrons var. albifrons)
Chaparral mallow (Malacothamnus fasciculatus)
Fremontedendron (Fremontodendron californicum)
Santa Cruz Island ironwood (Lyonothamnus floribundus ssp. asplenifolius)
Mock heather (Ericameria ericoides)
Long stem buckwheat (Eriogonum elongatum)
Giant coreopsis (Leptosyne gigantea)
Best time to visit:
Winter, spring and early summer
Winter and early spring rains bring water back into the marsh. The preserve at its finest when it is filled with water and migratory birds. Early summer brings out new blooms and slightly drier conditions which makes touring the preserve easier. The demonstration gardens are always amazing.
The Madrona Marsh preserve and nature center sit on one of the few remnants of what was once a vast wetland system that stretched from Marina del Rey to Wilmington. Included in this area are the Ballona Wetlands and the Gardena Willows Preserve, which are also mentioned in this guide. Its 42 acres are home to a strange collection of micro habitats: vernal marshes, a seasonal marsh that in the dry season recedes into the aquifer, back dunes, these are dunes that are farther back from the water than the foredunes which are closer (great naming), coastal prairie and alkali margin, an area of higher salt content caused by fluctuations of water, and vernal pools. .
The Nature Center , which is across the street from the Preserve, is surrounded by a half acre of beautiful mature demonstration gardens. They were started in 2001 by Tony Barker with the aim to promote more native gardens in the area.They are divided into habitat sections, back dune, coastal sage scrub, chaparral, riparian and desert. There are so many wonderful plants packed into this relatively small space making a visit a joyfully intense experience.

There are details everywhere. The large shrubs move gracefully to smaller, more delicate plants. There is always something to see and the garden is always changing. In Spring the bush lupins, mariposa lilies and coastal sunflowers are in bloom. Summer brings the fremontendrons, the buckwheats and mallows. The garden lets those plants that would go summer dormant, which adds a new intensity to space.
“The Nature Center , which is across the street from the Preserve, is surrounded by a half acre of beautiful mature demonstration gardens. They were started in 2001 by Tony Barker with the aim to promote more native gardens in the area.”
Little trails criss-cross through the garden and also define the now rather fuzzy borders of the different habitats. Despite its wild appearance the garden is meticulously cared for. I don’t think I have ever seen a weed and the garden hosts several species such as Ithuriel’s Spear and mariposa lilies which are specifically hard to care for.

The preserve is entered through a gate with a gate attendant. If you are wondering if this is because visitors have been locked in the preserve before (the whole section is fenced in), I asked, the answer is yes. There are several walking trails in the preserve, one that runs the whole perimeter and others the criss-cross through it. It is here that you will find all the interesting micro habitats. Madrona Marsh is considered to be one of, if not the only, remaining vernal marshes and is the largest preserve of coastal prairie and the last remaining vernal pools, in Los Angeles County. The vernal marsh is temporary, only existing in the wet season, and then slipping underneath the sand into the aquifer in the dry season.
The development of Torrance and changes to the site altered the water flow into the marsh and the vernal pools. To compensate for this, water is now pumped in during the rainy season mimicking what would be the natural water cycle of the site. The nine vernal pools are also undergoing restoration and maintenance. The pools and the surrounding areas are dredged, mostly by hand, to redirect and collect water. Invasive plants are removed and native plants, most of which are propagated on site, are reestablished around the areas of the pools.

In addition, the preserve is home to or periodically hosts over 100 special status species. Special status is a blank term that is used to describe species that are sufficiently rare as to require protection and or consideration. They are listed as rare, threatened or endangered by the Federal and or state government.
“In addition, the preserve is home to or periodically hosts over 100 special status species. Special status is a blank term that is used to describe species that are sufficiently rare as to require protection and or consideration. They are listed as rare, threatened or endangered by the Federal and or state government.”
The site has a fascinating geological history as well. It was part of the historic route west of the Los Angeles river until the rise of the Palos Verdes peninsula routed the river south to Long Beach. This created a natural inland depression. The site is covered with fine sand that has been deposited through the aeolian process, which is the erosion, transportation and deposition of sediment by wind.
This complex mix of rare ecosystems has been awarded a SEA designation, which stands for Significant Ecological Area, and is awarded to locations of irreplaceable biological resources that support valuable and threatened species and promote species movement through habitat linkages and corridors.

As the City of Torrance grew in the 1950’s and 1960’s the city found itself losing large tracts of open space. The solution was to convert sites that were otherwise set aside for oil drilling. Madrona Marsh was one such area. It had been left open for drilling since 1920 but had never had more than one platform on the site and, therefore, was both undeveloped and relatively undisturbed.
While mostly ignored by the general public, the site had already been recognized as having an ecological value. It was a popular birding destination and had been used in botany and zoological courses over the years. In 1972, a meeting was held to create support for the creation of a preserve and wildlife park. Not long after this meeting the Friends of Madrona Marsh was formed and they became the driving force behind the creation of the preserve.
The group battled away for years. They paid for a “Wildlife Habitat Study” to be conducted and for plans to be drawn up for a preserve and visitors center. They led talks, held public meetings and began restoring the land. In 1980 the Torrance Investment Company, (a partnership of Watt Homes, Anderson Properties, Sherl Curci and Santa Fe Energy, the landowners) withdrew an offer to sell 15 acres of the land to the Friends of Madrona Marsh and began to actively try to develop the land.

The group battled away for years. They paid for a “Wildlife Habitat Study” to be conducted and for plans to be drawn up for a preserve and visitors center. They led talks, held public meetings and began restoring the land.
In 1980 the Torrance Investment Company, (a partnership of Watt Homes, Anderson Properties, Sherl Curci and Santa Fe Energy, the landowners) withdrew an offer to sell 15 acres of the land to the Friends of Madrona Marsh and began to actively try to develop the land.
In one memorable City Council meeting the Torrance Investment Company suggested that the marsh “be moved” (because that’s a thing) two and a half miles north to Columbia Park. The story of the Preserve is written as a joint effort between the Friends of the Madrona Marsh and the City, however it is important to note that the City Council was siding with developers at this point.
“In one memorable City Council meeting the Torrance Investment Company suggested that the marsh “be moved” (because that’s a thing) two and a half miles north to Columbia Park.”
The City did eventually side with the Marsh and in 1987 42 acres were preserved for the creation of the Nature Center and Marsh Preserve. The Nature Center was built in 1990. The Metropolitan Water District funded the demonstration gardens and the Preserve is run with funding from the Santa Monica Bay Restoration Project.


More Information
Opening Hours:
Tues. – Sat.
10AM-5PM



























