Osaka Prefecture Dam

1429-Inakura Pond

2.5
1429-Inakura Pond Osaka Prefecture Dam
This article can be read in about 5 minutes to read.

Date of interview: Saturday, 06/08/2013

After visiting Shintaki Pond and Takino Pond, the next stop was Inakura Pond. The map showed that, like Shintaki no Ike, Inakura Pond has become a place of recreation and relaxation for local citizens, with a playing field and the Izumisano City Outdoor Activity Center located there.

Stone monument on the right bank

Tenkei relics...I can't read it. Perhaps it is a stone monument honoring the construction of the dam. The Inakura Pond Dam was constructed in conjunction with the Inakura Pond Water Pipeline in response to concerns about water shortages caused by the destruction of irrigation canals and reservoirs during the war due to the construction of the Sano Airfield.

Stone monument on the right bank
Stone monument on the right bank

Construction was suspended due to a shortage of materials and labor and postwar turmoil, but resumed in 1950, completed in 1957, and renovated in 1993.

The Inakura Pond Water Pipeline is an irrigation canal constructed as part of the "Prefectural Izumisano City Outside 1 Rikicho Water Improvement Project." With Inakura Pond as the parent pond, the pipeline connects Oshiri Pond, Karai Pond, Nuno Pond, and Suehiro Pond. I believe this stone monument honors this long-held wish.

View of the after-flow water discharge and the upstream face of the embankment from the right bank

The spillway is a side channel type of the type often seen in earth dams and rockfill dams.

View of the after-flow water discharge and the upstream face of the embankment from the right bank
View of the after-flow water discharge and the upstream face of the embankment from the right bank

View of the Inakura Bridge over the spillway and the top of the bridge from the right bank.

The top end of the bridge is open to automobile traffic, but it dead-ends at this point. There are traces of poles and blocks in front of the bridge, so it is possible that automobile traffic was previously prohibited.

View of the Inakura Bridge over the spillway and the top of the bridge from the right bank.
View of the Inakura Bridge over the spillway and the top of the bridge from the right bank.

View of the upstream spillway from the Inakura Bridge

It is said to be the largest irrigation reservoir in Izumisano City, and the size of its residual water discharge is quite impressive. Incidentally, Inakura Pond has been designated as one of the "100 Greenery Ponds of Osaka" established at the time of the International Garden and Greenery Exposition.

View of the upstream spillway from the Inakura Bridge
View of the upstream spillway from the Inakura Bridge

Looking downstream from the bridge over the spillway

For some reason, a portion of the road ahead is culverted.

Looking downstream from the bridge over the spillway
Looking downstream from the bridge over the spillway

Downstream side of the dike from the right bank? View of the downstream face of the embankment from the right bank

The downstream face of the atmosphere is not dam-like at all. The ground extends a little lower just below the embankment. It is said to be a rock-fill dam with an embankment height of 32.2 m, but it appears to have been filled in like the pond at Shintaki. A path on the right leads to a log cabin called "Inakura no Sato.

Downstream side of the dike from the right bank? View of the downstream face of the embankment from the right bank
Downstream side of the dike from the right bank? View of the downstream face of the embankment from the right bank

Gathering square and log house "Inakura-no-sato

It is a gathering plaza, but it seems to be a parking lot. It is not clear what the log cabin is used for, but I guess it is a sort of administration office for the teacher who is leading the group.

Gathering square and log house "Inakura-no-sato
Gathering square and log house "Inakura-no-sato

Izumi no Mori Satoyama Map

Around Inakura Pond, a satoyama seems to be preserved as "Izumi no Mori" (forest of mountain work, forest of shiny-leaved trees, forest of health, and forest of life).

Izumi no Mori Satoyama Map
Izumi no Mori Satoyama Map

Walking around the area

I thought the downstream face of the levee was further downstream of the ground (sports square), and from here I strayed as far as I could.

Walking around the area
Walking around the area

Walking around the area Part 2

It couldn't be, it was just dense vegetation.

Walking around the area Part 2
Walking around the area Part 2

View of the downstream conduit from the right bank

Return from the log cabin to the levee. We will be at the entrance portion of the culvert, where we came all the way downstream from the spillway.

View of the downstream conduit from the right bank
View of the downstream conduit from the right bank

View of the top edge and downstream face of the dike from the right bank

The embankment height is 32.2m, but it seems to have been filled in by the ground (sports square). I think it will increase the stability of the dam, but it does not look like a dam, which is a bit disappointing. Moreover, it is a rock-fill dam, but it looks like an earth dam.

View of the top edge and downstream face of the dike from the right bank
View of the top edge and downstream face of the dike from the right bank

View of the top edge from the left bank

If a stranger saw it, they wouldn't think it was a dam.

View of the top edge from the left bank
View of the top edge from the left bank

View of the upstream face of the embankment from the left bank

The reservoir side is shielded by concrete.

View of the upstream face of the embankment from the left bank
View of the upstream face of the embankment from the left bank

left bank (of a river) walking path

After passing through the top edge, the trail leads to a walking path from which one can only proceed on foot or by two-wheeled vehicle.

left bank (of a river) walking path
left bank (of a river) walking path

View of the dam lake from the left bank walking path

There are also people enjoying fishing at the dam lake.

View of the dam lake from the left bank walking path
View of the dam lake from the left bank walking path

Slant-flume intake system

There is a slant-flume water intake facility on the left bank. This would be the starting point of the Inakura Pond water pipeline. There is also a sign that says "No Fishing"... Apparently, fishing used to be allowed, but it has been prohibited since sometime ago.

Slant-flume intake system
Slant-flume intake system

Stairs to Ryuoh Shrine

Climbing the stairs with the red railing on the left, you will find the Ryuoh Shrine, which is dedicated to praying for safety during the construction of Inakura Pond and to protect the pond. For some reason, however, I did not go up there at that time. In retrospect, I regret that I should have climbed the stairs.

Stairs to Ryuoh Shrine
Stairs to Ryuoh Shrine

View of the dam lake from the left bank

Inakura Pond was a bit unusual in that it was a rock-fill dam but had an earth dam-like appearance, and the downstream side was filled in with ground, which lowered the apparent height of the embankment.

View of the dam lake from the left bank
View of the dam lake from the left bank

Inakura Pond

LocationInakura, Hineno-cho, Izumisano-shi, Osaka
River NameInakura River, Sano River system
ObjectiveA (irrigation water)
W(Water for water supply)
ModelR (Rock-fill dam)
Bank height32.2m
Bank length173.1m
Dam volume220,000 m3
Watershed Area4.4 km2
Reservoir area14 ha
Total storage capacity1,283,000 m3
Effective water storage capacity1,183,000 m3
Dam operatorOsaka (metropolitan area)
Main body constructorYawata Construction
Year of launch1942
Year Completed1957
Name of Dam LakeInakura Pondtemple's head temple built at the end of the Edo period

Other facilities/observations

Parking lot
Toilet×
Park
PR Exhibition Hall×
Fishing×

Map around Inakura Pond

Weather around Inakura Pond

Accommodations that may be close to Inakura Pond

This article was written by.
Shin Jinma

Dam enthusiast who loves Momosuke Fukuzawa / Dampedia and Dam News administrator / Certified Dammeister (01-018) by the Japan Dam Foundation / Started selling discharge caution goods.https://shop.dampedia.com

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