Hochwasserrückhaltebecken Alfhausen-Rieste
Hochwasserrückhaltebecken Alfhausen-Rieste
Top 6 Natural Monuments in Hochwasserrückhaltebecken Alfhausen-Rieste
Best natural monuments in Hochwasserrückhaltebecken Alfhausen-Rieste are found within a significant natural area in Lower Saxony, Germany. This region functions as a flood retention basin and a vital ecological habitat, designated as a nature reserve and an EU bird sanctuary. The area features extensive water bodies, wet grasslands, and forested sections, offering diverse natural landscapes. It provides important resting and overwintering grounds for numerous waterbird species.
Best natural monuments in Hochwasserrückhaltebecken Alfhausen-Rieste
- The most popular natural monuments is Alfsee Reserve…
Last updated: August 15, 2026
Alfsee Overflow Weir
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Alfsee Reserve Basin Nature Reserve
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Alfsee Flood Retention Basin
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Reserve basin in the Natur- und Geopark TERRA.vita
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A popular refuge for waterfowl of all kinds. Since the area is also quite wooded, it's not possible to see deep into the reserve basin from every corner. Depending on the wildlife activity, the path along the dike can be quite lengthy.
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The 330 m long overflow sill, the inlet of the Alfsee, was built in 1974 with a 10 hectare settling basin. This is where sand and alluvial particles that would worsen the water quality of the lake are supposed to settle. The outlet structure was also built in 1974.
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Alfhausen-Rieste flood retention basin With a storage capacity of up to 20.8 million cubic meters, the Alfhausen-Rieste flood retention basin between Bramsche and Bersenbrück is the second largest such facility in Lower Saxony. The structure, built between 1970 and 1996, absorbs a large portion of the Hase flood water via a feeder when required and releases its contents back into the Hase in measured amounts via the drain after the flood event has passed. Before the basin was put into operation, the Hase overflowed its banks here during small to medium floods and flooded large valley areas as far as the Cloppenburg area - including many populated areas. The facility consists of a main basin and a reserve basin, which is used as soon as the storage capacity of the main basin, the so-called "Alfsee", is exhausted. Even if the reserve basin is full during major floods (e.g. a 25-year flood), the remaining flood water must be channelled through or partly discharged via the Tiefe Hase in the Hase valley floodplain.
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The entire reserve basin, including the dams, covers an area of 152.5 hectares, and the area within the dams that is protected is 123 hectares. The basin floor is at around 35.00 to 37.00 m above sea level, and the height of the dams, whose crest width is 4 m, is 43.75 m above sea level. The usable storage space is 8.1 million m³ at a height of 41.75 m above sea level. The reserve basin is flowed through by the 1.15 km long culvert between the balancing and outlet structures. Around 30 m³ of water per second can be drained from the Alfsee via the culvert. The basin is only flooded during particularly large floods, when the 12.7 million m³ storage space of the main basin is exhausted and the water cannot be drained via the Hase.
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The Hase flows through small gates into the Alfsee.
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The water of the Hase flows through the Alfsee.
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It's best to drive on top of the dike instead of on the small pavement below.
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Approx. 5 km direct circular route. Species-rich area. Belongs to Terra.Vita. There is no seating around. If you want to have a picnic, bring a seat textile with you.
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Frequently Asked Questions
What makes the Hochwasserrückhaltebecken Alfhausen-Rieste region significant as a natural monument?
The entire Hochwasserrückhaltebecken Alfhausen-Rieste is designated as a nature reserve (Naturschutzgebiet) and an EU bird sanctuary (EU-Vogelschutzgebiet Alfsee). It's a vital ecological habitat and an internationally important resting and overwintering ground for numerous waterbirds, showcasing how flood protection infrastructure can enhance natural ecosystems.
Which areas are best for birdwatching within the Hochwasserrückhaltebecken Alfhausen-Rieste?
Both the Alfsee and especially the Alfsee Reserve Basin Nature Reserve offer exceptional birdwatching. The Reserve Basin is less impacted by recreational activities and provides ideal conditions for diverse waterbirds, including a cormorant colony and Whooper Swans. White-tailed eagles have also been sighted here since 2019.
What kind of wildlife can I expect to see in the Hochwasserrückhaltebecken Alfhausen-Rieste?
The region is home to approximately 94 different species of water and wading birds. During migration seasons and in winter, you can observe large flocks of species like Northern Shovelers, Tufted Ducks, Eurasian Wigeons, and Goosanders. The Reserve Basin is particularly known for cormorants, Whooper Swans, and even white-tailed eagles.
Are there family-friendly natural monuments or activities in the area?
Yes, several natural monuments are considered family-friendly, including the Alfsee and the Alfsee Overflow Weir. The area around the Alfsee offers recreational activities, and the Naturschutz- und Bildungszentrum Alfsee (Nature Conservation and Education Center Alfsee) provides educational opportunities for all ages.
What are the best viewpoints to experience the natural beauty of the region?
The Alfsee Overflow Weir offers excellent views over the large reservoir. Additionally, walking paths, often on dikes, around the Alfsee Reserve Basin Nature Reserve provide wonderful perspectives of the nature reserve inside the basin and the surrounding meadows and forests.
What outdoor activities can I do near the natural monuments in Hochwasserrückhaltebecken Alfhausen-Rieste?
The area is excellent for various outdoor activities. You can find numerous running trails, road cycling routes, and MTB trails. Many paths are suitable for easy walks or bike rides around the Alfsee, offering both active recreation and opportunities for quiet contemplation of nature.
Are there easy walking trails suitable for beginners or those seeking a relaxed experience?
Yes, the paths around the Alfsee are generally flat and suitable for short, undemanding hikes or walks. The circumnavigation of the Alfsee Reserve Basin Nature Reserve on the dike is also a popular option, taking about an hour and offering wonderful views without significant elevation changes.
What is the best time of year to visit for nature observation?
The migration seasons and winter months are particularly rewarding for birdwatching, as large flocks of waterbirds use the Alfsee and Reservebecken as resting and overwintering grounds. Spring also offers beautiful scenery and new life, as noted by visitors.
Can I bring my dog to the natural monuments in Hochwasserrückhaltebecken Alfhausen-Rieste?
While the area is a nature reserve, many paths around the Alfsee are suitable for walks with dogs. However, please be mindful of wildlife, especially in sensitive bird breeding and resting areas like the Alfsee Reserve Basin Nature Reserve, and keep dogs on a leash where required.
What do visitors enjoy most about the natural monuments in this region?
Visitors frequently highlight the exceptional birdwatching opportunities, the peaceful atmosphere, and the easy-to-navigate paths around the lakes. Many appreciate the combination of natural beauty and recreational options, noting that even in summer, quiet spots can be found for relaxation.
Are there facilities like cafes or restaurants near the natural monuments?
While the immediate vicinity of the nature reserve focuses on conservation, the broader Alfsee area, particularly near the Alfsee Ferien- und Erholungspark, offers facilities. Visitors have recommended places like Rhodes Heuerhaus for coffee and cake, suggesting that dining options are available nearby.
What is the terrain like for walking and cycling around the Alfsee?
The terrain around the Alfsee is generally flat with no significant altitude changes, making it ideal for easy walking and cycling. Paths are often well-maintained, including a dedicated pedestrian/bicycle path around the Alfsee. Some paths, especially around the Alfsee Reserve Basin Nature Reserve, are on dikes, which can be exposed to wind.
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